1Make buttered bread crumbs by placing 2 tablespoons butter in a small skillet and melt on medium high heat. Stir in 1/2 cup dry bread crumbs and keep stirring until bread crumbs have absorbed butter and begin to brown a bit. Set aside to put on top of casserole.
2Preheat oven to 350 degrees.
Cook noodles and drain. Stir onions into chicken meat. Arrange in layers in a buttered baking dish. Begin with 1/2 of the noodles, then 1/2 of the chicken, then 1/2 of gravy. Repeat layers. Put bread crumbs on top.