Prepare Chicken: Cut each boneless chicken breast into three equal pieces. Place the chicken pieces in a bowl and let them marinate in the refrigerator overnight.
Preheat Oven: Preheat your oven to 375°F (190°C). This temperature ensures that the chicken cooks thoroughly while allowing the creamy topping to become golden and bubbly.
Make Creamy Topping: In a small bowl, combine the 1 cup mayonnaise (or Greek yogurt), half of the 1 cup Parmesan cheese, 1 teaspoon garlic powder, 1 teaspoon seasoning salt, and ½ teaspoon black pepper. Mix until well combined and smooth. This creamy mixture will add rich flavor and moisture to the chicken.
Assemble & Coat: Take a baking dish and arrange the marinated chicken pieces evenly in a single layer. Spread the mayonnaise mixture generously over each chicken piece, ensuring they are evenly coated. This layer seals in moisture and adds tremendous flavor.
Final Cheese Layer & Bake: Sprinkle the tops of the chicken pieces with the remaining half of the Parmesan cheese. Bake in the preheated oven for 40 to 45 minutes, or until the chicken is cooked through and the topping is golden brown and bubbly. To ensure doneness, the internal temperature of the chicken should reach 165°F (74°C).
Serve: Once cooked, remove from the oven and serve this delightful dish to your guests or family. The chicken will be tender and juicy with a flavorful, crispy topping.