In a microwave-safe 2-quart casserole, place in butter and cook until melted. Remove and stir in parsley flakes, lemon juice, garlic and salt. Add shrimp, toss to coat. Cover and Microwave at high for 3 to 5 minutes. Cooking time will vary with the size of shrimp. When cooked shrimp will appear pink. Serve over hot cooked rice and sprinkle with paprika if you desire.