01 -
Preheat oven to 375°F and lightly grease a 9x13-inch baking dish with olive oil.
02 -
In a small mixing bowl, combine olive oil, Italian seasoning, crushed red pepper flakes, garlic powder, onion powder, and 1/2 teaspoon of salt. Stir until evenly blended.
03 -
Place chicken breasts on a cutting board. Using a sharp knife, cut a deep pocket into the thickest part of each breast, taking care not to slice through.
04 -
Rub the prepared seasoning blend over all sides and inside the pockets of the chicken breasts. Transfer to the refrigerator to marinate until assembly.
05 -
In a medium bowl, combine ricotta cheese, grated mozzarella, grated Parmesan, steamed chopped spinach, minced garlic, and the remaining 1/2 teaspoon salt. Add ground black pepper to taste and mix until fully incorporated.
06 -
Remove marinated chicken breasts from the refrigerator. Fill each pocket with the cheese and spinach mixture. Secure openings with toothpicks if necessary.
07 -
Arrange stuffed chicken breasts in the prepared baking dish. Bake for 25 minutes, turning halfway for even browning. Alternatively, sear on the stovetop in an oven-safe skillet before baking.
08 -
Remove toothpicks before serving. Present hot and accompany with your choice of side.