French Onion Dip with Truffle Oil

French Onion Dip with Truffle Oil is simple, but most versions stop at a packet mixed into sour cream. This one starts with real caramelized onions, a white wine deglaze, and finishes with white truffle oil for something that tastes like it came from a restaurant.

Rich, savory, and layered with flavor. It's the kind of appetizer that makes people stop mid-conversation to ask what's in it, even though it was made in less than 1 hour.

I am a dip-oholic and the first time I tried the French Onion Dip at Maxwells Trading in Chicago, I knew I had to recreate my own version. They serve theirs warm but I made a cold version of what I envisioned was going into theirs.

The French Onion Soup I grew up loving - those slow-cooked onions, the deep beefy broth, that truffle finish - is exactly what inspired this dip.

The result is something that fits right in at a party, a game day spread, or just a night in when you want something better than average. If you're already making this, my French Onion Pasta uses the same flavor backbone - deeply savory, onion-forward, and way more than the sum of its parts.

Why This Recipe Works

• Real caramelized onions - not softened, not browned, actually caramelized. Three full onions cooked low and slow until they're jammy and sweet. That's the foundation this whole dip is built on.
• The sherry vinegar and beef broth reduction adds a savory, slightly tangy depth that cuts through the richness of the sour cream and mayo base. It's the step that separates a homemade French onion dip from anything store-bought.
• Chilling the onion mixture before combining is key. It keeps the dip thick and helps the flavors settle and deepen before you serve it.
• White truffle oil as a finish adds an earthy, aromatic layer that makes this feel like something you'd order at a restaurant - not something you threw together before guests arrived. Get this same effect with Mushroom Truffle Pasta.

Recipe Ingredients

• Yellow Onions - Yellow onions have the right balance of sweetness and savory depth for caramelizing. Don't rush this step - low heat and patience is what gets you those super sweet, golden onions. Too high of heat will burn the onions and give bitter flavor rather than sweet.
• Sherry Vinegar - This is what gives the dip a subtle brightness that balances the richness. A splash goes in with the beef broth during the deglaze. It's not overpowering - it just keeps everything in balance.
• Beef Broth - Adds that savory, umami-forward depth. Combined with the sherry vinegar and white wine, you're building a reduction that tastes like it simmered all day.
• Sour Cream and Mayo - The base that brings it all together. Sour cream adds tang and creaminess, mayo adds body and richness. Together they create that classic dip texture you want and use in many dips like pimento cheese.
• White Truffle Oil - This is the finish. A drizzle on top just before serving adds an earthy, luxurious note. I use a good quality truffle oil - a little goes a long way. Trust me, you will ruin this dish with too much. Give the oil a good smell before using it; it helps you gauge the strength and flavor before using.
• White Wine - Look for a dry wine rather than sweet wine to round out the sweet onions. Think chardonnay or Sauv Blanc.
• Potato Chips - I prefer Graza sea salt potato chips for serving. The clean saltiness pairs really well with the richness of the dip without competing with the flavor.

See recipe card below for a full list of ingredients and measurements.

Substitutions & Variations

• Red onions, shallots, or sweet onions can be used in place of yellow, though yellow onions give the most balanced flavor for a French onion dip recipe. Use leftover glazed shallots in place of caramelized onions.
• White wine can be swapped for dry vermouth or even a splash of chicken broth or white grape juice if you prefer to skip the wine.
• Greek yogurt can replace sour cream for a lighter taste with more protein.
• For a heartier serving option, this dip works really well with toasted crostini, soft pretzel, or sliced baguette alongside the chips.

This recipe has not been tested with other substitutions or variations. If you replace or add any ingredients, please let us know how it turned out in the comments below!

How To Make French Onion Dip With Truffle Oil

Step 1: Caramelize the Onions - Add diced yellow onions to a large skillet over medium-low heat with a drizzle of olive oil. Cook low and slow, stirring every 5 minutes, until deeply golden and jammy. This takes 35-45 minutes. Don't rush it.

Step 2: Build the Flavor - Add minced garlic, fresh thyme, kosher salt, and black pepper directly to the caramelized onions. Stir and cook for 1 minute until fragrant. Deglaze and Reduce - Pour white wine in and scrape up any brown bits stuck to the pan. Add beef broth and sherry vinegar. Let everything reduce over medium heat until the liquid is almost completely gone. The mixture should look glossy and concentrated. Chill - Transfer the onion mixture to a bowl and let it cool completely in the refrigerator or freezer. This step matters - adding warm onions to the sour cream and mayo will make the dip loose and thin.

Step 4: Mix the Dip - Once chilled, fold the caramelized onion mixture into sour cream and mayo until fully combined. Taste and adjust salt if needed but remember, flavors will develop as it sits.

Step 5: Finish and Serve - Transfer to a serving bowl, drizzle with white truffle oil, and top with fresh chives. Serve with potato chips.

Expert Cooking Tips

• Do not salt the onions until after the caramelization process is done. Salt draws out the moisture which will then steam or boil the onions rather than caramelizing them.
• Low and slow is the only way to truly caramelize onions. If your heat is too high, you'll brown them without developing that deep sweetness. Patience here is what makes this dip different.
• Don't skip chilling the onion reduction. It's not just about food safety - the flavors deepen as they cool and the texture of the finished dip stays thick and scoopable.
• Reduce until almost completely dry. If you leave too much liquid in the pan, it will water down the dip base. You want the onion mixture to be nearly paste-like before it goes into the fridge.
• Taste after mixing and before serving. Caramelized onions can vary in saltiness depending on your broth, so always taste and adjust before it hits the table.
• Make it ahead. This caramelized onion dip actually tastes better the next day, which happens with many dips and sauces like chimichurri too. The flavors have more time to come together. Make it the night before, keep covered in the fridge, and add the truffle oil and chives right before serving.

Serving Suggestions

This homemade French onion dip works with more than just chips - though chips are the move if you ask me.

• Graza Sea Salt Potato Chips - My first choice. The clean salt and crunch pair with the richness of the dip without competing.
• Toasted Baguette or Crostini - Great for a party spread. Adds a little more structure for scooping.
• Crudités - Sliced cucumber, radishes, and celery balance the richness and keep things fresh.
• Pretzel Chips - The salty, malty crunch plays really well against the savory onion base.

This dip fits right in on a charcuterie or appetizer spread alongside other shareable snacks. The savory truffle finish makes it feel like something you'd find on a restaurant appetizer menu.

My smoked cream cheese with hot honey is another crowd-favorite dip situation. Different flavor profile but same energy. Put both out and see which one disappears first.

More Appetizers You'll Love

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📖Recipe

French Onion Dip with Truffle Oil

Krista Stechman

This caramelized onion dip starts with jammy onions slow cooked until caramelized, a white wine deglaze and truffle oil finish. Make it ahead, it gets even better overnight! Grab a bag of your favorite potato chips and dig in.

5 from 3 votes

Print Recipe Pin Recipe

Prep Time 15 minutes mins

Cook Time 40 minutes mins

Total Time 55 minutes mins

Course appetizer

Cuisine american, French

Servings 6 servings

Calories 185 kcal

Ingredients

  

1x2x3x

• ▢ 1 drizzle olive oil
• ▢ 3 yellow onions small dice
• ▢ 1 teaspoon kosher salt Diamond Crystal
• ▢ ¼ teaspoon black pepper coarse ground
• ▢ 5 cloves garlic minced
• ▢ 1 tablespoon fresh thyme stemmed and chopped
• ▢ ¼ cup white wine
• ▢ 2 tablespoon sherry vinegar
• ▢ ½ cup beef broth 1½ tsp. knorr liquid beef stock concentrate mixed with ½ cup water
• ▢ 1 cup sour cream full fat
• ▢ ¼ cup mayo full fat, Hellmans or Dukes
• ▢ 1 teaspoon kosher salt Diamond Crystal
• ▢ 1 drizzle white truffle oil
• ▢ 2 teaspoon chives minced

Instructions

 

• Drizzle a little olive oil in a large skillet, add diced onions to and cook over low heat for 35-45 minutes stirring occasionally until onions are soft, dark and caramelized
• Once onions are caramelized, add salt, pepper, garlic and fresh thyme. Stir and allow to cook for an additional minute
• Deglaze the pan with white wine, scraping up all the brown bits from the bottom. Add sherry vinegar and beef broth then allow mixture to reduce until almost all liquid has evaporated
• Transfer onion mixture to a heat proof bowl then allow to chill in the freezer for 10 minutes. After chilling, mix in sour cream and mayo then transfer to a serving dish
• Drizzle a very small amount of truffle oil over the top then garnish with chives and serve alongside potato chips

Notes

Scrape the bottom of the pan as the onions cook, stirring every 5-10 minutes

Low and slow is the name of the game with caramelized onions. Turning the heat up will result in either a burnt onion or an onion that's cooked too quickly and hasn't caramelized.

I like to chill my onions in the freezer to speed up the cooling process before adding sour cream and mayo.

A little truffle oil goes a LONG way. Do not over pour.

Dip tastes great fresh and even better after sitting for a day or two. This recipe is great for holidays and football parties. 

Nutrition

Calories: 185kcalCarbohydrates: 9gProtein: 2gFat: 15gSaturated Fat: 5gPolyunsaturated Fat: 5gMonounsaturated Fat: 4gTrans Fat: 0.02gCholesterol: 27mgSodium: 925mgPotassium: 216mgFiber: 2gSugar: 4gVitamin A: 1424IUVitamin C: 18mgCalcium: 78mgIron: 1mg

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