Thaw shrimp, if frozen, in a 10-inch frypan. Saute shrimp and onion in margarine over medium heat for 3 to 5 minutes or until shrimp are opaque. Add mushrooms and heat. Sprinkle in flour, salt and pepper; reduce heat. Stir in sour cream and cook gently for 8 to 10 minutes, not allowing mixture to boil. Serve over rice.
Makes 6 servings.
Cajun Country -- New Iberia, Louisiana