Preheat your oven to 375°F (190°C).
Place the chicken breasts in a baking dish. If they’re super thick, I usually slice them horizontally to help them cook evenly.
In a bowl, mix together the mayonnaise, Parmesan cheese, garlic powder, onion powder, salt, and pepper.
Spread that creamy mixture over each chicken breast like you’re tucking them into a delicious cheesy blanket.
Bake uncovered for 25–30 minutes, or until the chicken is fully cooked and the topping is beautifully golden and bubbling.
Garnish with parsley if you're feeling fancy. Serve hot with rice, potatoes, or veggies!