Preheat your oven to 400°F (200°C).

Combine the ricotta cheese, chopped spinach, grated Parmesan, minced garlic, salt, and pepper in a bowl.

Roll out the puff pastry on a lightly floured surface until it's about 1/4 inch thick. Cut the pastry into 3-inch squares.

Spoon a generous dollop of the filling into the center of each pastry square. Fold the corners together or shape them into triangles.

Arrange the filled pastries on a parchment-lined baking sheet and brush the tops with egg wash.

Bake for 15-20 minutes, or until golden brown and puffed up.

Cool slightly before serving warm.