Created by BettyinDenver on July 31, 2012
Step 1: Grease 1 1 1/2 quart baking dish. Cook and drain macaroni, following package directions; place in a large mixing bowl.
Step 2: In a large skillet, melt 3 tablespoons butter over medium low heat. Add chopped onion, mushrooms, and chopped green bell pepper. Cook stirring frequently, for 3 to 4 minutes, or until onion is softened and mushrooms are browned.
Step 3: Add skillet mixture to macaroni with chopped olives, shredded cheese, sour cream, salt and pepper, chicken, and milk.
Step 4: Transfer chicken and macaroni mixture to baking dish. Sprinkle buttered bread crumbs over the top of macaroni and chicken casserole.
Step 5: Bake at 350° for 25 to 35 minutes, or until chicken casserole is bubbly and breadcrumbs are lightly browned.