Combine: 1/2 c. sour cream 2 tsp. flour

Stir until smooth.

Stir in: 1 tbsp. minced onion 1/8 tsp. cayenne pepper

Bake uncovered in preheated 425 degree oven until fish is opaque. Sprinkle 1/2 cup shredded Cheddar cheese and bake until cheese is just melted.