Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.

In a pan, sauté the diced onions and minced garlic until softened. Add the chopped spinach and cook until wilted. Remove from heat and let it cool.

In a mixing bowl, combine the sautéed spinach mixture, grated Parmesan, cream cheese, salt, and pepper. Mix until well combined.

Roll out the thawed puff pastry sheet on a lightly floured surface. Cut it into squares, depending on your desired puff size.

Spoon a generous portion of the spinach and cheese mixture onto the center of each puff pastry square.

Fold the pastry over the filling to create a triangle or rectangle shape, sealing the edges.

Place the spinach puffs on the prepared baking sheet and bake in the preheated oven for 15-18 minutes, or until the pastry is golden and puffed.

Serve and Enjoy:

Allow the Cheesy Spinach Puffs to cool slightly before serving. They can be enjoyed warm as a delightful appetizer or snack.