Preheat oven to 450 degrees. In a shallow bowl, stir together 1/4 c fine dry bread crumbs, 2 tbsp grated Parmesan cheese, 1 tbsp cornmeal, 1 tsp olive oil, 1/2 tsp Italian seasoning, 1/8 tsp garlic powder and 1/8 tsp pepper; set aside. Coat the rack of a broiling pan with cooking spray. Place the cod on the rack, folding under any thin edges of the filets. Mix 2 tbsp of mayo and 1 tsp lemon juice and brush on fish, then spoon the crumb mixture evenly on top. Bake for 10 to 12 minutes or until the fish flakes easily when tested with a fork and is opaque all the way through.