These Caramelized Onion Tartlets are elegant, bite-sized appetizers perfect for holiday parties and gatherings. The sweet, deeply caramelized onions paired with a crisp pastry shell make them easy to eat while mingling, leaving one hand free for a festive drink. Simple yet impressive, they’re a crowd-pleasing vegetarian option.

Why You’ll Love This Recipe :

• Sweet and savory flavor combination

• Perfect handheld appetizer for parties

• Simple ingredients with elegant results

• Vegetarian-friendly and easy to prepare

Equipment :

• 12-cup mini muffin tin

• Large skillet

• Rolling pin

• 3-inch round cookie cutter

• Cutting board

• Knife

• Measuring cups and spoons

• Oven

Ingredients :

• 2 tablespoons olive oil

• 2 cups very thinly sliced yellow onions

• 1 1/2 tablespoons unsalted butter

• 1/2 teaspoon sugar

• 1/4 teaspoon kosher salt

• 1/2 teaspoon freshly ground black pepper

• 1 teaspoon balsamic vinegar

• Pie dough for one 9-inch single-crust pie (store-bought or homemade)

• 3–4 tablespoons crème fraîche

• Fresh thyme sprigs, for garnish

Instructions :

1. Preheat the oven to 375°F and lightly grease a 12-cup mini muffin tin with cooking spray.

2. Heat the olive oil in a large skillet over low heat. Add the onions, butter, sugar, 1 tablespoon water, salt, and pepper. Cook for about 10 minutes, stirring occasionally.

3. Add the balsamic vinegar and continue cooking for 25–30 minutes, until the onions are deeply golden and caramelized.

4. While the onions cook, roll out the pie dough to just under 1/8-inch thickness.

5. Cut out 12 rounds using a 3-inch cookie cutter and gently press each round into a muffin cup.

6. Bake the pastry shells for 10–12 minutes, until lightly golden.

7. Remove the shells from the tin and arrange on a platter.

8. Spoon a small amount of crème fraîche into each shell, top with caramelized onions, and garnish with fresh thyme. Serve warm or at room temperature.

Tips & Notes :

• Low and slow cooking gives the onions their best flavor.

• Don’t rush the caramelization process.

• Keep pastry scraps chilled before re-rolling if needed.

Storage & Make-Ahead :

• Make-Ahead: Prepare the onions up to 2 days in advance and refrigerate.

• Fridge: Store assembled tartlets for up to 1 day.

• Freezer: Not recommended once assembled.

• Reheat: Warm gently in the oven before serving.

Serving Suggestions :

• Serve alongside other holiday appetizers

• Pair with sparkling wine or cocktails

• Add to a vegetarian appetizer platter

Frequently Asked Questions

Q1: Can I substitute crème fraîche?
A1: Yes, sour cream works well as a substitute.

Q2: Can I make these ahead of time?
A2: Yes, prep the components ahead and assemble shortly before serving.

Q3: How do I keep the tart shells crisp?
A3: Let the shells cool completely before filling and avoid overfilling.