Caramelized Onion Tartlets | Easy Make Ahead Recipe

Golden pastry tarts topped with caramelized onions and fresh herbs arranged on parchment paper.

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Caramelized Onion Tartlets | Easy Make Ahead Recipe

The combination of buttery pastry and rich, sweet onions creates a delicious bite that's a great appetizer for any occasion. They're easy simple to prepare and can be made ahead of time for added convenience.

Course Appetizer

Cuisine French

Keyword caramelized onion tartlets, caramelized onion tarts, caramelized onions, sweet onions, tarts

Prep Time 10

Cook Time 30

Servings servings

Calories 188kcal

Author Paula

Equipment

Ingredients

For the caramelized onions

2 tablespoons (about 1 fl oz / 30 mL) olive oil or butter
2 large (about 16 oz / 450 g onions I prefer Vidalia, thinly sliced
salt and pepper to taste
1 tablespoon (about 0.5 fl oz / 15 mL) balsamic vinegar optional, for added sweetness

For the tartlets

1 sheet (about 8 oz / 225 g) puff pastry store-bought
½ cup (about 4 oz / 115 g) Crème fraîche or sour cream
¼ cup (about 1 oz / 28 g) parmesan cheese grated, or Gruyère or Cheddar
1 tablespoon fresh thyme

Instructions

Step 1: Caramelize the onions

Heat olive oil or butter in a large skillet over medium-low heat.
2 tablespoons (about 1 fl oz / 30 mL) olive oil
Add the sliced onions and a pinch of salt, cooking for 20-25 minutes until golden and soft, stirring occasionally. If using, add balsamic vinegar halfway through cooking for extra sweetness. Season with pepper, then set aside.
2 large (about 16 oz / 450 g onions, salt and pepper to taste, 1 tablespoon (about 0.5 fl oz / 15 mL) balsamic vinegar

Step 2: Prepare the pastry

Preheat the oven to 375°F (190°C).
Roll out the puff pastry sheet on a floured surface. Cut into small circles or squares, depending on your preference.
1 sheet (about 8 oz / 225 g) puff pastry
Place the pastry into tartlet pans or a muffin tin, gently pressing to fit.

Step 3: Assemble the tartlets

Spread a thin layer of crème fraîche or sour cream in each pastry shell.
½ cup (about 4 oz / 115 g) Crème fraîche
Spoon the caramelized onions evenly into the pastry shells.
Sprinkle with grated cheese and fresh thyme (if using). Season with salt and pepper.
¼ cup (about 1 oz / 28 g) parmesan cheese , 1 tablespoon fresh thyme

Step 4: Bake

Bake the tartlets for 15-20 minutes, or until the pastry is golden and puffed, and the cheese is melted and slightly browned.

Step 5: Serve

Let the tartlets cool for a few minutes before serving. They can be enjoyed warm or at room temperature.

Nutrition