Gather all ingredients. Preheat the oven to 350 degrees F (175 degrees C).
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Place chicken pieces into a 9x13-inch baking dish.
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Stir together mayonnaise, garlic, rosemary, salt, and black pepper in a bowl.
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Spread mayonnaise mixture over chicken; top with Parmesan cheese.
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Bake in the preheated oven until no longer pink in the center and the juices run clear, about 1 hour and 10 minutes. An instant-read thermometer inserted into the center should read at least 165 degrees F (74 degrees C).
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