Preheat the oven to 375°F.

Use a sharp knife to cut a pocket into each chicken breast without slicing all the way through.

In a bowl, combine shredded mozzarella, chopped spinach, and cooked quinoa.

Stuff each chicken breast with the mixture and seal with toothpicks if necessary.

Mix garlic powder, paprika, salt, and pepper and rub over the chicken breasts.

Place the stuffed chicken breasts in a baking dish and bake for 35-40 minutes until cooked through and golden on top.

Remove from oven and let rest for 5 minutes before serving.