Preheat oven to 450 degrees.
Spray rimmed baking sheet with non stick cooking spray.
Pat chicken breasts dry and season with kosher salt, pepper and 1/4 teaspoon of garlic powder.
Arrange chicken breasts on one side of sheet pan and spread 1/2 tablespoon of mayo on top of each chicken breast.
Top each chicken breast with two slices of prosciutto followed by provolone slices.
Spray provolone slices lightly with non stick cooking spray and sprinkle bread crumbs on top.
Season again with salt and pepper.
Spray top of breadcrumbs again lightly with cooking spray to help them brown. Add broccoli to other side of sheet pan.
Drizzle broccoli with 2 teaspoons of olive oil and season with salt, pepper and a sprinkle of garlic powder.
Toss tomatoes with 1 teaspoon of olive oil, salt, pepper and a sprinkle of garlic powder and set aside.
Bake in oven for about 20 minutes, or until chicken has reached 165 degrees.
Add tomatoes to sheet pan half way through cooking time.
Sprinkle with fresh parsley.