01 - Preheat your oven to 400°F. Lightly grease a baking dish.
02 - In a medium bowl, combine cream cheese, mozzarella, cheddar, parsley, thyme, garlic powder, onion powder, salt, and pepper. Mix until smooth and well combined.
03 - Place the chicken breasts on a cutting board. Using a sharp knife, cut a pocket horizontally into the thickest part of each breast, being careful not to cut all the way through.
04 - Stuff each chicken breast with an equal amount of the cheese mixture, pressing the filling in gently. Secure the openings with toothpicks if needed.
05 - Brush the outside of the chicken breasts with olive oil. Season with salt, black pepper, and paprika.
06 - Arrange the stuffed chicken breasts in the prepared baking dish.
07 - Bake for 30–35 minutes, or until the chicken is cooked through (internal temperature should reach 165°F) and the tops are golden brown.
08 - Remove toothpicks, garnish with extra parsley if desired, and serve hot.