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Gruyère Puff Pastry Tart

Irresistible Gruyère Puff Pastry Tart for Cozy Evenings

This Gruyère Puff Pastry Tart combines flaky pastry, rich Gruyère cheese, and caramelized onions for a comforting dish perfect for cozy nights.
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Prep Time 30 minutes
Cook Time 18 minutes
Total Time 48 minutes
Servings: 8 slices
Course: Appetizers
Cuisine: French
Calories: 300
Ingredients Equipment Method Nutrition Notes

Ingredients
  

For the Tart Base
  • 1 sheet Puff Pastry thawed store-bought
  • 2 tablespoons Butter
  • 1 tablespoon Olive Oil for sautéing onions
For the Filling
  • 3 medium Onions sliced, yellow onions preferred
  • 1 tablespoon Sugar for caramelization
  • 1 pinch Salt to taste
  • 1 cup Heavy Cream substitute with light cream if desired
  • 1 large Egg for binding
  • to taste Black Pepper freshly ground
  • 1 cup Gruyère Cheese grated, or substitute with Swiss cheese
  • 1 tablespoon Dijon Mustard optional
  • 1 tablespoon Fresh Thyme for garnish
  • to taste Sea Salt for finishing

Equipment

  • Skillet
  • baking sheet
  • mixing bowl

Method
 

Step‑by‑Step Instructions
  1. Melt butter and olive oil, add sliced onions, sugar, and salt. Cook for 25-30 minutes until caramelized.
  2. Preheat oven to 400°F (200°C).
  3. Roll out puff pastry, score a border, and prick the inner section.
  4. Whisk heavy cream, egg, and black pepper. Fold in grated Gruyère cheese.
  5. Spread Dijon mustard, pour cheese mixture in the scored border, and layer caramelized onions on top.
  6. Bake in the preheated oven for 15-18 minutes until golden brown.
  7. Sprinkle fresh thyme and sea salt, slice, and serve warm or at room temperature.

Nutrition

Serving: 1sliceCalories: 300kcalCarbohydrates: 30gProtein: 6gFat: 20gSaturated Fat: 10gPolyunsaturated Fat: 0.5gMonounsaturated Fat: 3gCholesterol: 50mgSodium: 350mgPotassium: 200mgFiber: 1gSugar: 2gVitamin A: 500IUVitamin C: 2mgCalcium: 100mgIron: 1mg

Notes

For best results, handle puff pastry gently and ensure it is chilled before baking. Can be made ahead and refrigerated before baking.

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