01 - Preheat your oven to 400°F. Lightly grease a baking dish with cooking spray or a small amount of oil.
02 - In a medium bowl, combine cream cheese, mozzarella, cheddar, parsley, thyme, garlic powder, onion powder, salt, and pepper. Mix until completely smooth and well incorporated.
03 - Place each chicken breast on a cutting board. Using a sharp knife, carefully cut a horizontal pocket into the thickest part of each breast without cutting all the way through to the other side.
04 - Divide the cheese mixture evenly among the chicken breasts, gently pressing the filling into each pocket. Secure openings with toothpicks if necessary to prevent leakage.
05 - Brush the outside of each stuffed chicken breast with olive oil. Season evenly with salt, black pepper, and paprika.
06 - Place the stuffed chicken breasts in the prepared baking dish, spacing them evenly for consistent cooking.
07 - Bake for 30 to 35 minutes until the chicken is fully cooked through. The internal temperature should reach 165°F and the tops should be golden brown.
08 - Carefully remove toothpicks before serving. Garnish with additional chopped parsley if desired. Serve immediately while hot.