Shrimp Au Gratin is a delicious recipe of the shrimp category, mainly prepared by the cooked shrimps, diced onions, grated cheese, flour, milk, and buttered bread crumbs. A quickly prepared Shrimp Au Gratin is prepared by many methods using different ingredients; the basic method involves addition of shrimp, cheese and other ingredients in the sauteed onion, and milk. The mixture is baked at 350 degrees until it turns brown. Shrimp Au Gratin is always served hot.