Preheat oven to 350F. Partially bake pie shell at 400F for 5-7 minutes. Melt butter in large skillet and saute green onions and mushrooms. Add crabmeat shrimp 3/4 cup Cheddar cheese, Parmesan, sauce egg and mayonnaise, stirring until moist. Drain off excess liquid if necessary. Spoon into pie shell an bake at 350F for 20 minutes. Add remaining Cheddar cheese. Bake for 10 minutes. Serve hot with fresh green salad.