Preheat the oven to 375°F (190°C).

Grease a muffin tin with cooking spray or olive oil.

Press a wonton wrapper into each cup of the muffin tin, forming a cup shape.

In a large mixing bowl, combine the chopped spinach, artichoke hearts, cream cheese, sour cream, Parmesan cheese, mozzarella cheese, minced garlic, onion powder, salt, black pepper, and crushed red pepper flakes (if using).

Mix until well combined and creamy.

Spoon the spinach and artichoke mixture evenly into each wonton cup.

Bake in the preheated oven for 15-20 minutes, or until the wonton edges are golden brown and the filling is hot and bubbly.

Remove from the oven and allow to cool slightly before serving.