01 -
Preheat oven to 375°F (190°C). Lightly grease a baking dish.
02 -
In a skillet, heat olive oil over medium heat. Add garlic and cook for 1 minute. Add spinach and sauté until wilted. Remove from heat and let cool slightly.
03 -
In a bowl, mix cream cheese, Parmesan, onion powder, red pepper flakes (if using), salt, pepper, and the cooled spinach mixture.
04 -
Cut a pocket into the side of each chicken breast, being careful not to cut all the way through.
05 -
Stuff each breast with the cream cheese mixture and secure with toothpicks if needed.
06 -
Place chicken breasts in the prepared baking dish. Optionally, top with shredded mozzarella. Bake for 25–30 minutes, or until chicken reaches an internal temperature of 165°F (74°C).
07 -
Let rest for 5 minutes before serving. Remove toothpicks and enjoy.