Caramelized Onion & Cheese Tartlets

Caramelized Onion & Cheese Tartlets are a delectable appetizer or snack, combining the sweet depth of slowly cooked onions with the savory richness of cheese, all encased in buttery, flaky pastry. These mini tartlets are a perfect balance of flavors and textures, making them a crowd-pleaser at gatherings or a luxurious bite for everyday enjoyment.

Why You’ll Love This Recipe

• A perfect harmony of sweet and savory flavors
• Ideal for parties, brunches, or holiday spreads
• Easy to prepare using store-bought puff pastry
• Can be made ahead of time and reheated
• Great as a vegetarian option for entertaining
• Customizable with different cheeses or added ingredients
• Crisp pastry with a rich and creamy filling
• Elegant in appearance, yet simple to make
• Delicious both warm and at room temperature
• A surefire way to impress guests with minimal effort

Ingredients

(Tip: You can find the complete list of ingredients and their measurements in the recipe card below.)

• Puff pastry sheets
• Yellow onions, thinly sliced
• Butter
• Olive oil
• Salt
• Sugar
• Fresh thyme (optional)
• Black pepper
• Gruyère cheese, grated (or cheddar, mozzarella, or goat cheese)
• Fresh parsley, chopped (for garnish)
• Egg (for egg wash)

Directions

1. Caramelize the Onions
   • In a skillet over medium-low heat, melt butter with a splash of olive oil. Add sliced onions and a pinch of salt.
   • Cook slowly, stirring occasionally, for 25–30 minutes until onions are deeply golden.
   • Add a pinch of sugar to help the caramelization process. Optionally, stir in fresh thyme. Set aside to cool.
2. Prepare the Pastry
   • Preheat oven to 375°F (190°C). Line a baking tray with parchment paper.
   • Roll out puff pastry and cut into circles or squares, depending on your preferred tartlet shape.
   • Place the pastry pieces onto the baking tray and score a smaller circle or border around each piece, being careful not to cut through completely.
3. Assemble the Tartlets
   • Spoon caramelized onions into the center of each pastry, staying within the scored lines.
   • Sprinkle generously with grated cheese and season with black pepper.
   • Brush edges of pastry with beaten egg for a golden finish.
4. Bake
   • Bake in the preheated oven for 18–22 minutes or until the pastry is puffed and golden brown and cheese is melted and bubbly.
5. Garnish and Serve
   • Remove from oven and allow to cool slightly. Garnish with chopped parsley and serve warm or at room temperature.

Servings and Timing

• Servings: 8–10 tartlets
• Preparation Time: 15 minutes
• Cooking Time: 30–35 minutes
• Total Time: 45–50 minutes

Variations

• Cheese Options: Use blue cheese, feta, goat cheese, or a blend of sharp cheddar and mozzarella for different flavor profiles.
• Add-ins: Add a layer of fig jam, roasted garlic, or chopped mushrooms for added depth.
• Mini Quiche Style: Beat an egg with cream and pour a small amount over the filling before baking for a quiche-like texture.
• Spicy Twist: Sprinkle crushed red pepper flakes or add a touch of Dijon mustard to the onions for a kick.
• Meaty Addition: Incorporate finely chopped bacon or pancetta with the onions for a non-vegetarian version.

Storage/Reheating

• Storage: Store cooled tartlets in an airtight container in the refrigerator for up to 3 days.
• Reheating: Reheat in a 350°F (175°C) oven for 8–10 minutes or until warmed through and crisp. Avoid microwaving to preserve the flaky texture.

FAQs

Can I make these tartlets ahead of time?

Yes, you can prepare them a day in advance and reheat in the oven just before serving.

What type of onion works best for caramelizing?

Yellow onions are ideal due to their natural sweetness, but white or red onions can also be used.

Can I freeze the tartlets?

It is best to freeze them unbaked, then bake directly from frozen, adding a few extra minutes to the baking time.

What cheese melts best for this recipe?

Gruyère and cheddar melt beautifully and complement the sweetness of the onions well.

Do I need to use egg wash on the pastry?

Egg wash helps achieve a glossy, golden crust but can be omitted if desired.

Can I make this gluten-free?

Yes, use a gluten-free puff pastry alternative and ensure all other ingredients are gluten-free.

Can I serve these tartlets cold?

They can be enjoyed at room temperature, but they taste best when slightly warm.

How can I make them vegan?

Use vegan puff pastry, caramelize onions with oil only, and use dairy-free cheese alternatives.

What herbs go well with this recipe?

Fresh thyme, rosemary, or parsley enhance the flavors beautifully.

Are these suitable as a main course?

They are best served as an appetizer or side dish, but can be part of a light lunch with a salad.

Conclusion

Caramelized Onion & Cheese Tartlets offer a refined yet easy-to-make addition to your culinary repertoire. Their rich flavor, delicate presentation, and adaptability make them perfect for special occasions, casual gatherings, or even a quiet evening at home. These savory pastries are sure to become a favorite go-to recipe.

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