01 - Preheat oven to 375°F. Lightly grease a 9x13 inch baking dish.
02 - Pat the chicken breasts dry and season both sides with salt and black pepper. Arrange them in the prepared baking dish.
03 - In a medium bowl, mix together mayonnaise (or Greek yogurt), 1/2 cup Parmesan, garlic powder, onion powder, paprika, and dried parsley until fully combined.
04 - Evenly spread the sauce mixture over the tops of the chicken breasts, covering them completely.
05 - Sprinkle with the remaining 1/4 cup Parmesan cheese and, if using, the breadcrumbs.
06 - Bake uncovered for 25–30 minutes, or until the chicken is cooked through (internal temperature 165°F) and the top is golden and bubbly.
07 - Let rest for 5 minutes before serving. Garnish with extra parsley if desired.