Step 1

Preheat the oven to 400 degrees F (200 degrees C). Line 2 baking sheets with parchment paper.

Step 2

Roll puff pastry over a floured surface; cut into 1 1/2-inch squares. Place on the prepared baking sheets.

Step 3

Bake in the preheated oven until lightly golden and crispy, 15 to 20 minutes.

Step 4

Transfer baked squares to a wire rack and let cool completely, about 5 minutes. Slice each square in half.

Step 5

Spread 2 tablespoons dulce de leche on 1/2 of the puff pastry squares; top with remaining puff pastry squares. Dust with confectioners' sugar.