Gruyere & Caramelized Onion Tarts

Total Time

Prep: 45 min. Bake: 15 min.


2 dozen

Updated: Aug. 17, 2023
Garlic and onion is a match made in heaven, in my opinion, so I love creating new recipes to showcase the pair. Gruyere cheese adds impeccable flavor to the eye-catching starter. —Lisa Speer, Palm Beach, Florida
Gruyere & Caramelized Onion Tarts Recipe photo by Taste of Home


  • 1 large sweet onion, thinly sliced
  • 2 tablespoons olive oil
  • 1 tablespoon butter
  • 3 garlic cloves, minced
  • 1/4 teaspoon salt
  • 1/4 teaspoon pepper
  • 1 package (17.3 ounces) frozen puff pastry, thawed
  • 1 cup shredded Gruyere or Swiss cheese
  • 1/4 cup grated Parmesan cheese
  • 2 tablespoons minced fresh thyme


  1. In a large skillet, saute onion in oil and butter until softened. Reduce heat to medium low; cook, uncovered, 40 minutes or until deep golden brown, stirring occasionally. Add garlic; cook 1 minute longer. Stir in salt and pepper.
  2. Unfold each puff pastry sheet onto an ungreased baking sheet. Using a knife, score decorative lines around the edges of each sheet. Spread onion mixture to within 1/2 in. of edges. Sprinkle with cheeses and thyme.
  3. Bake at 400° for 12-15 minutes or until golden brown. Cut each tart into 12 pieces. If desired, top with additional fresh thyme and Parmesan cheese. Serve warm.

Nutrition Facts

1 piece: 142 calories, 9g fat (3g saturated fat), 7mg cholesterol, 125mg sodium, 13g carbohydrate (1g sugars, 2g fiber), 3g protein.