Caramelized Onion and Gruyère Beef Tartlets

Buttery puff pastry cups filled with slow-simmered onions and melted Gruyère cheese, perfect for a savory keto appetizer or light lunch.

Cuisine: French

Category: Beef

Prep: 20 minutes. Cook: 20 minutes.

Serves 4.

Ingredients

• 1 sheet (14 oz), thawed puff pastry
• 2, thinly sliced yellow onions
• 2 tbsp butter
• 1/2 cup, shredded Gruyère cheese
• 1/4 cup heavy cream
• 1 tsp, chopped fresh thyme
• 1/4 tsp salt
• 1/8 tsp black pepper

Instructions

1. Step 1: Preheat oven to 400°F (200°C). Cut puff pastry into 4-inch squares and press each into a muffin tin cavity, pressing up the sides.
2. Step 2: Melt 2 tbsp butter in a skillet over medium heat, add 2 thinly sliced yellow onions, and cook for 20-25 minutes, stirring occasionally, until deeply golden and caramelized.
3. Step 3: In a small bowl, combine 1/2 cup shredded Gruyère cheese, 1/4 cup heavy cream, 1 tsp chopped thyme, 1/4 tsp salt, and 1/8 tsp black pepper.
4. Step 4: Spoon the caramelized onions evenly into each pastry cup, then top with the cheese mixture.
5. Step 5: Bake for 18-20 minutes until pastry is golden and cheese is bubbly, then cool for 5 minutes before serving.