– 1 (16 oz.) container, sour cream – 1/2 c. mayonnaise – 1/2 c. Parmesan cheese, grated – 1/4 c. white vinegar – 1 Tbsp. dried parsley flakes – 2 cloves garlic, minced (about 1 1/2 tsp.) – 1 tsp. garlic salt – 1/2 tsp. onion powder – 1/2 tsp. ground pepper