This Caramelized Onion Dip is one of my favorite appetizers to make when I’m hosting. The slow-cooked onions add so much flavor, while the crispy bacon and melted cheese make every bite rich, creamy, and savory. It’s always a hit with crackers or toasted sourdough.
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Why This Recipe Works
I love making this Caramelized Onion Dip for holidays and gatherings because it’s rich, cheesy, packed with flavor, and easy to prepare ahead of time!
- Sweet, Slow-Caramelized Onions: The onions and shallots cook low and slow in bacon fat until deeply golden, soft, and naturally sweet. A little balsamic vinegar, brown sugar, and Worcestershire sauce add even more savory flavor.
- Four Cheeses for the Perfect Creamy Texture: Cream cheese, sharp cheddar, mild cheddar, mozzarella, and Gruyère create a rich, creamy dip with plenty of melted cheese in every bite. It’s that same cheesy goodness I love in these Chicken Sandwich Melts.
- Loaded with Crispy Bacon: Cooking the onions in the bacon fat adds so much flavor, and folding crispy bacon into the dip gives every bite a little smoky, salty goodness. I also save some bacon for the top!
- Perfect for Holiday Entertaining: I love that this dip can be assembled ahead of time and refrigerated until I’m ready to bake. It’s a great make-ahead appetizer for parties, just like these Smoked Salmon Crostini.
- Golden, Bubbly, and Crispy on Top: The dip bakes until hot and bubbly, then gets a final sprinkle of crispy fried onions and a quick broil. That crunchy topping with the creamy, cheesy center is my favorite part, especially when served with toasted sourdough or crackers.
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Ingredients
- Thick-Cut Bacon – I love using thick-cut bacon because it gets nice and crispy while adding a rich, smoky flavor to the dip. We also use some of the rendered bacon fat to caramelize the onions, which adds even more flavor.
- Yellow Onions – The star of this dip! Yellow onions are naturally sweet and become soft, golden, and deeply flavorful when slowly caramelized. I prefer yellow onions for their balanced sweetness, but sweet onions work well, too.
- Shallots – Shallots have a slightly sweeter, milder flavor than regular onions. They add another layer of flavor to the caramelized onion mixture. If you don’t have shallots, you can substitute with a small yellow onion.
- Balsamic Vinegar – A little balsamic vinegar adds tanginess and a subtle sweetness that balances the richness of the bacon and cheese.
- Brown Sugar – Helps bring out the natural sweetness of the caramelized onions and balances the savory ingredients. Light or dark brown sugar will both work.
- Worcestershire Sauce – Adds a deep, savory flavor to the caramelized onions. A little goes a long way and pairs especially well with the bacon and cheese.
- Cream Cheese – Creates the thick, rich, and creamy base of the dip. I recommend using full-fat, softened cream cheese for the smoothest texture.
- Sour Cream – Adds creaminess with a slight tang that helps balance the richness of the cheese and bacon. Full-fat sour cream works best, but plain Greek yogurt can be used as a substitute.
- Mayonnaise – Helps make the dip extra creamy and smooth while adding a little richness. I recommend using regular mayonnaise for the best texture.
- Seriously Sharp Cheddar Cheese – Adds a bold, tangy cheese flavor that stands out against the sweetness of the caramelized onions. I like shredding my own cheese because it melts much better than pre-shredded cheese.
- Mild Cheddar Cheese – Balances the sharp cheddar with a smoother, milder flavor. It also adds to the creamy, cheesy texture of the dip.
- Mozzarella Cheese – Gives the dip that gooey, stretchy, melted cheese texture. I recommend using low-moisture mozzarella for the best results.
- Gruyère Cheese – Adds a rich, nutty, slightly sweet flavor that pairs beautifully with caramelized onions. If you can’t find Gruyère, Swiss cheese is a great substitute.
- Crispy Fried Onions – Sprinkled over the dip before broiling, these add a delicious golden, crunchy topping that contrasts perfectly with the creamy cheese underneath.
- Crackers or Toasted Sourdough – Perfect for scooping up all that warm, cheesy goodness! I especially love serving this dip with toasted sourdough because it’s sturdy enough to hold the thick, creamy dip without falling apart.
For full list of ingredients and instructions, see recipe card below.
Instructions
- Cook the Bacon & Onions: Crisp the bacon, then caramelize the onions and shallots in the bacon grease.
- Add Seasonings & Creamy Base: Stir in garlic and seasonings. In a separate bowl, mix cream cheese, sour cream, and mayo.
- Mix & Assemble: Fold cheeses, caramelized onions, and bacon into the creamy mixture. Transfer to a baking dish and top with reserved cheese and bacon.
- Bake & Serve: Bake until bubbly, top with crispy fried onions, and broil until golden. Serve warm!
For full list of ingredients and instructions, see recipe card below.
Substitutions & Variations
Here are some of my favorite substitutions and variations:
- Cheese Options: I love the combination of sharp cheddar, mild cheddar, mozzarella, and Gruyère, but you can swap in Swiss, Monterey Jack, or smoked Gouda. I recommend using freshly shredded cheese for the smoothest melt.
- Bacon Options: I usually use thick-cut bacon for its crispy texture and smoky flavor. You can also use turkey bacon or leave the bacon out and caramelize the onions in butter for a meatless version.
- Onion Options: Yellow onions are my favorite because they become sweet and tender when caramelized. You can also use sweet onions, red onions, or a combination of whatever you have on hand.
What to Serve with Caramelized Onion Dip
Bread & Dippers
- For a cozy appetizer spread, we love serving this caramelized onion dip with homemade Sourdough Focaccia Bread. Its crispy, golden crust and soft, airy center make it perfect for scooping up all that creamy, cheesy goodness. Sourdough Rye Bread is another delicious option, adding a slightly earthy, tangy flavor that complements the sweet caramelized onions.
- If you’re hosting a holiday gathering or game-day party, Jalapeño Cheddar Sourdough Bread makes a flavorful pairing with its cheesy goodness and little kick of heat. We also love serving Cheesy Sourdough Garlic Bombs for an easy-to-share appetizer that everyone can enjoy.
Appetizers
- When putting together an appetizer spread, Smoked Salmon Crostini adds a fresh, elegant option alongside this rich onion dip. For something lighter and refreshing, Shrimp Spring Rolls with Creamy Peanut Dipping Sauce bring a crisp, colorful contrast to the table.
- For a fun party spread, Stuffed Sourdough Cheese Bread is another crowd-pleasing choice. Its warm, garlicky, cheesy bites are perfect for sharing alongside a bowl of warm caramelized onion dip.
FAQs
How long does it take to caramelize the onions?
Caramelizing the onions takes about 40–50 minutes over medium-low heat. I know it seems like a long time, but cooking them slowly brings out their natural sweetness and gives the dip its rich, savory flavor. Stir occasionally and add small splashes of water if the onions start sticking to the skillet.
Why is my caramelized onion dip oily?
A little oil on top is normal because this dip contains bacon and several kinds of cheese. To prevent excess grease, avoid adding more than ¼ cup of bacon fat when cooking the onions, and drain the cooked bacon well. I also recommend using freshly shredded cheese because it tends to melt more smoothly.
Can I make this dip in a slow cooker?
Yes, although I prefer baking it because the oven gives the cheese a beautiful golden topping. Prepare the bacon and caramelized onions as directed, then combine everything in a slow cooker and cook on low for about 2–3 hours, or until hot and melted. Stir occasionally and add the crispy fried onions right before serving.
How do I know when the dip is ready?
The dip is ready when the cheese is completely melted, the center is hot, and the edges are bubbling. This usually takes about 20–25 minutes in a 350°F oven. I like to finish it with crispy fried onions and broil for 1–2 minutes until the top is lightly golden.
How do I store and reheat leftover Caramelized Onion Dip?
Store leftover dip in an airtight container in the refrigerator for up to 3–4 days. To reheat, place it in an oven-safe dish, cover with foil, and warm at 350°F until heated through, or microwave individual portions in short intervals, stirring occasionally.
More Recipes You’ll Enjoy
- Creamy Ranch Chicken and Broccoli Casserole – creamy ranch chicken and broccoli casserole has creamy mashed potatoes on the bottom with a cheesy chicken and broccoli baked to perfection!
- Sourdough Pull-Apart Sweet Bread – A sweet and fluffy sourdough pull-apart bread made with an enriched dough and filled with different fillings like fruit jam and Nutella.
- Greek Potato Salad – Vibrant Greek salad topped with creamy tzatziki sauce, paired with golden roasted potatoes. A delightful Mediterranean-inspired dish bursting with flavor!
- Sourdough Cinnamon Rolls – Fermentation adds flavor depth to cinnamon buns. Soft rolls layered with cinnamon sugar, baked golden-brown, gooey, and topped with mascarpone cheese icing.
If you try this Caramelized Onion Dip recipe, let me know what you think! Rate and review this recipe in the comments below. Don’t forget to take a picture and tag me on Instagram @lizasfarmhouse!
Caramelized Onion Dip
This Caramelized Onion Dip is one of my favorite appetizers to make when I’m hosting. The slow-cooked onions add so much flavor, while the crispy bacon and melted cheese make every bite rich, creamy, and savory. It’s always a hit with crackers or toasted sourdough.
Ingredients
- 1 lb thick-cut bacon chopped
- 2 yellow onions thinly sliced
- 2 shallots thinly sliced
- salt a pinch
- water as needed for caramelizing (I used 3 tablespoons)
- 6 garlic cloves minced
- 1-2 teaspoons fresh thyme leaves
- 1-2 teaspoons balsamic vinegar
- 1 tablespoon brown sugar
- 1 tablespoon Worcestershire sauce
- 8 ounces cream cheese softened
- 1 cup sour cream
- ½ cup mayonnaise
- 4 ounces seriously sharp cheddar freshly shredded
- 4 ounces mild cheddar freshly shredded
- 4 ounces mozzarella freshly shredded
- 3 ounces Gruyère freshly shredded
- black pepper freshly cracked, to taste
- crispy fried onions for topping
- crackers or toasted sourdough, for serving
Instructions
- Cook the chopped bacon in a large skillet over medium heat until crispy. Transfer it to a paper towel-lined plate, reserving some for the topping. Leave up to ¼ cup of bacon fat in the skillet.
- Add the sliced onions, shallots, and a pinch of salt to the skillet. Cook over medium-low heat for 40–50 minutes, stirring occasionally, until the onions are deeply golden and soft. Add small splashes of water as needed to loosen the browned bits and prevent the onions from burning.
- During the last 2–3 minutes of cooking, stir in the minced garlic, thyme, balsamic vinegar, brown sugar, and Worcestershire sauce. Remove from the heat and allow the mixture to cool slightly.
- Preheat the oven to 350°F. In a large bowl, combine the softened cream cheese, sour cream, and mayonnaise, mixing until smooth.
- Reserve about ½ cup of the shredded cheese mixture for the topping. Stir the remaining cheese into the creamy base, then fold in the caramelized onion mixture and cooked bacon. Season with freshly cracked black pepper.
- Spread the mixture evenly into a shallow 2- to 3-quart baking dish. Sprinkle the reserved shredded cheese and bacon over the top.
- Bake for 20–25 minutes, or until the dip is heated through and bubbling around the edges.
- Sprinkle the crispy fried onions over the dip and broil for 1–2 minutes, watching closely, until golden.
- Allow the dip to rest for 5 minutes before serving warm with crackers or toasted sourdough.
Notes
- Take your time caramelizing the onions. Cook them low and slow for 40–50 minutes until deeply golden and soft. Rushing this step can leave the onions bitter or undercooked.
- Slice the onions evenly. Keep the onion and shallot slices similar in thickness so they caramelize at the same rate.
- Save some bacon fat. Leave up to ¼ cup of rendered bacon fat in the skillet to caramelize the onions. It adds a delicious smoky flavor without needing extra oil.
- Use water to prevent burning. If the onions start sticking or browning too quickly, add a tablespoon of water and scrape up the flavorful browned bits from the bottom of the skillet.
- Add garlic toward the end. Stir in the minced garlic during the last 2–3 minutes of caramelizing. This keeps it fragrant without burning or becoming bitter.
- Soften the cream cheese first. Let the cream cheese sit at room temperature for about 30 minutes before mixing. Softened cream cheese blends more easily with the sour cream and mayonnaise for a smooth, creamy base.
- Shred your own cheese. Freshly shredded cheddar, mozzarella, and Gruyère melt more smoothly than pre-shredded cheese. It’s worth the extra few minutes for a creamier dip.
- Let the onions cool slightly. Allow the caramelized onion mixture to cool for a few minutes before folding it into the creamy base. This makes everything easier to combine evenly.
- Don’t overdo the salt. Bacon, cheddar, Gruyère, and Worcestershire sauce already add plenty of saltiness. Taste the mixture before adding any extra seasoning.
- Use a shallow baking dish. A shallow 2- to 3-quart baking dish helps the dip heat evenly and gives you more surface area for that golden, cheesy topping.
- Save the crispy onions for last. Add the crispy fried onions after baking, then broil for just 1–2 minutes. Keep a close eye on them because they can burn quickly.
- Let the dip rest before serving. Give it about 5 minutes after removing it from the oven. This allows the cheese to settle slightly, making the dip easier to scoop.
- Make it ahead for the holidays. Assemble the dip up to 24 hours in advance, cover tightly, and refrigerate until ready to bake. Add a few extra minutes to the baking time if it’s going straight from the refrigerator into the oven.
- Serve with sturdy dippers. This dip is thick, creamy, and loaded with bacon and onions, so toasted sourdough, baguette slices, and sturdy crackers work best for scooping.
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