Preheat the oven to 375˚F. Lightly spray a 9x13 glass pan. Place the chicken inside and set aside.
In a medium bowl, mix together the mayonnaise, Parmesan, seasoning salt, pepper and garlic powder.
Spread the mayonnaise mixture over the chicken. Sprinkle some extra Parmesan on top of the chicken.
Bake in the preheated oven for 45 minutes.