In a mixing bowl, combine chopped spinach, cream cheese, sour cream, Parmesan cheese, minced garlic, salt, and black pepper. Mix until well combined.

Preheat the oven to 400°F (200°C). Roll out the puff pastry sheets on a lightly floured surface and cut into circles using a cookie cutter.

Place a spoonful of the spinach filling in the center of each pastry circle. Fold the pastry over and seal the edges with a fork.

Place the assembled bites on a baking sheet and bake in the preheated oven for 15 minutes, or until golden brown.

Remove from the oven and let cool slightly before serving. Enjoy warm.