Why I’ll Love This Recipe

I combine classic French onion flavor with fresh basil pesto.
I make it with simple ingredients that are easy to find.
I prepare it ahead of time for even better flavor.
I serve it as a dip or a sandwich spread.
I customize it with my favorite herbs and cheeses.
I enjoy a creamy, savory appetizer that’s perfect for entertaining.

Ingredients

(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)

2 tablespoons olive oil
2 large yellow onions, thinly sliced
1 cup sour cream
1 cup mayonnaise
¼ cup basil pesto
2 tablespoons cream cheese, softened
1 teaspoon Worcestershire sauce
1 garlic clove, minced
½ teaspoon salt
¼ teaspoon black pepper
2 tablespoons chopped fresh chives or parsley, for garnish (optional)

Directions

I heat the olive oil in a large skillet over medium-low heat.
I add the sliced onions and cook them slowly for 30 to 40 minutes, stirring occasionally, until they become soft, golden, and deeply caramelized.
I remove the onions from the heat and let them cool completely.
I combine the sour cream, mayonnaise, cream cheese, basil pesto, Worcestershire sauce, garlic, salt, and black pepper in a medium mixing bowl.
I stir until the mixture becomes smooth and creamy.
I fold the cooled caramelized onions into the dip until evenly combined.
I cover the bowl and refrigerate the dip for at least 1 hour so the flavors can meld together.
I garnish with chopped chives or parsley before serving if I want a fresh finish.
I serve the dip with potato chips, crackers, toasted bread, pretzels, or fresh vegetables.

Servings and Timing

Servings: 8
Prep Time: 10 minutes
Cook Time: 35 minutes
Chill Time: 1 hour
Total Time: 1 hour 45 minutes

Variations

I use Greek yogurt instead of sour cream for a lighter version.
I stir in grated Parmesan for an extra savory flavor.
I add crispy bacon for a smoky twist.
I mix in chopped sun-dried tomatoes for extra richness.
I use spinach pesto instead of basil pesto for a different flavor profile.
I add a pinch of crushed red pepper flakes for a little heat.

Storage/Reheating

I store the dip in an airtight container in the refrigerator for up to 4 days. I give it a good stir before serving since some separation may occur during storage. I serve it chilled or let it sit at room temperature for about 15 minutes to soften slightly before enjoying. I do not recommend freezing because the creamy texture may change after thawing.

FAQs

Can I make this dip ahead of time?

Yes. I like preparing it a day in advance because the flavors become even richer after chilling overnight.

What can I serve with this dip?

I enjoy serving it with potato chips, pita chips, crackers, pretzels, toasted baguette slices, celery, carrots, cucumber slices, and bell peppers.

Can I use store-bought pesto?

Yes. I often use store-bought basil pesto for convenience, but homemade pesto works wonderfully too.

Can I make this dip lighter?

Yes. I substitute Greek yogurt for some or all of the sour cream and use light mayonnaise if I want a lighter version.

Can I freeze this dip?

I do not recommend freezing it because the dairy ingredients can separate and become grainy after thawing.

Conclusion

I love making this Homemade French Pesto Onion Dip because it combines creamy, savory, and herbaceous flavors into one irresistible appetizer. The sweet caramelized onions and vibrant pesto create a unique twist on a classic onion dip that’s perfect for parties, game days, or casual snacking. Whether I pair it with crunchy chips or fresh vegetables, this dip is always a crowd-pleasing favorite.

Homemade French Pesto Onion Dip

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This Homemade French Pesto Onion Dip combines sweet caramelized onions with creamy sour cream, mayonnaise, and fresh basil pesto for a rich, savory appetizer. It’s perfect for serving with chips, crackers, fresh vegetables, or as a flavorful sandwich spread.

Author: Laura
Prep Time: 10 minutes
Cook Time: 35 minutes
Total Time: 1 hour 45 minutes
Yield: 8 servings
Category: Appetizer
Method: Stovetop
Cuisine: American
Diet: Vegetarian

Instructions

Heat the olive oil in a large skillet over medium-low heat.
Add the sliced onions and cook for 30 to 40 minutes, stirring occasionally, until soft, golden, and deeply caramelized.
Remove the onions from the heat and let them cool completely.
In a medium bowl, combine the sour cream, mayonnaise, cream cheese, basil pesto, Worcestershire sauce, garlic, salt, and black pepper.
Stir until smooth and creamy.
Fold the cooled caramelized onions into the mixture until evenly combined.
Cover and refrigerate for at least 1 hour to allow the flavors to meld.
Garnish with chopped chives or parsley if desired.
Serve chilled with potato chips, crackers, toasted bread, pretzels, or fresh vegetables.

Notes

Substitute Greek yogurt for some or all of the sour cream for a lighter version.
Stir in grated Parmesan for extra savory flavor.
Add crispy bacon for a smoky variation.
Mix in chopped sun-dried tomatoes for added richness.
Use spinach pesto instead of basil pesto for a different flavor profile.
Add crushed red pepper flakes for a little heat.
Store in an airtight container in the refrigerator for up to 4 days and stir before serving.
Freezing is not recommended because the dairy ingredients may separate.

Nutrition

Serving Size: 2 tablespoons
Calories: 210 kcal
Sugar: 3 g
Sodium: 230 mg
Fat: 21 g
Saturated Fat: 5 g
Unsaturated Fat: 15 g
Trans Fat: 0 g
Carbohydrates: 5 g
Fiber: 0 g
Protein: 2 g
Cholesterol: 20 mg