Heat butter in nonstick skillet, add red pepper and cook for 3 minutes. Add shrimp, salt and pepper to taste and cook until shrimp are just fully cooked. Transfer to a bowl and allow to cool a few minutes.
Butter a 9 X 13 casserole dish. Season fish on both sides with salt and pepper and place in dish.
Add remaining ingredients except parmesan cheese to the pepper and shrimp mixture and mix well.
Spread mixture equally on to the top of both filet's making sure the thickness of the topping remains equal. Sprinkle with parmesan Cheese.
Heat oven to 350 degrees. Cover casserole dish and bake for 18 minutes covered.
Remove cover, place under broiler and broil on low for 5 minutes. Watch to make sure it doesn't burn.
Switch oven back to bake at 350 degrees for another 5 minutes.
Remove from oven, let rest 2 or 3 minutes and serve.