Preheat oven to 375. In an oiled cast iron skillet or 9x13 baking dish, add in chicken breast. Season with salt, pepper, garlic powder and onion powder. Spread mayo over each chicken breast and top with shredded cheese. Add in broccoli around the chicken and sprinkle grated parmesan over the top
Cover with foil and bake for 15 minutes. Remove foil and bake for another 10 minutes or until chicken is cooked through, reaching an internal temperature of 165 F, and cheesy is melted and golden. Remove from oven and serve right away