Ingredients

  • 3 medium sweet onions
  • 4 tablespoons butter
  • 8 ounces fresh mushrooms, sliced
  • 2 (8 ounce) cups shredded swiss cheese, divided
  • 1 (10 3/4 ounce) can condensed cream of mushroom soup, undiluted
  • 1 (5 ounce) can evaporated milk
  • 2 tablespoons Worcestershire sauce
  • 6 slices French bread (1/2 inch thick)

Method

  • Cut onion in half from top to bottom, then with cut side down, slice moderately thinly.
  • Melt butter in a large skillet over medium-high heat, cook onions and mushrooms, stirring constantly until tender.
  • Spoon onion/mushroom mixture into lightly greased 2 quart baking dish.
  • Sprinkle with 1 cup of cheese.
  • Combine soup, milk and worcestershire sauce and pour over cheese.
  • Top with bread slices and sprinkle with remaining cheese.
  • Cover and refrigerate for 4 to 8 hours.
  • Remove baking dish from refrigerator and let stand at room temperature for 30 minutes.
  • Bake covered at 375° for 30 minutes.
  • Uncover and bake 15 to 20 additional minutes or until thoroughly heated.
  • Let stand 5 minutes before serving.