Scalloped Vegetables

1 1/2 cups cooked sliced carrots
  1 1/2 cups cooked celery slices
  1 (10-ounce) package cooked frozen peas, 1 1/2 to 2 cups
  8 ounces sliced mushrooms, sauteed in butter
  2 cups prepared medium white sauce, recipe link below
  Buttered crumbs
  Grated Parmesan or other cheese, if desired

 

Preparation:
.
Combine vegetables and medium white sauce. Place in a greased 1 1/2-quart casserole or baking dish. Top vegetable mixture with with buttered crumbs and sprinkle with grated cheese, if desired. Cook at 350° for 25 to 30 minutes, until heated through.