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Heavenly Onion Casserole

I like to serve this side often. It goes wonderfully with many different main dishes including chicken, beef, lamb or pork.—Maryln Rose, Naples, Florida
  • Total Time
    Prep: 15 min. + chilling Bake: 45 min.
  • Makes
    6-8 servings


  • 2 tablespoons butter
  • 3 medium sweet Spanish onions, sliced
  • 8 ounces fresh mushrooms, sliced
  • 1 cup shredded Swiss cheese
  • 1 can (10-3/4 ounces) condensed cream of mushroom soup, undiluted
  • 1 can (5 ounces) evaporated milk
  • 2 teaspoons soy sauce
  • 6 to 8 slices French bread (1/2 inch thick)
  • 6 to 8 thin slices Swiss cheese (about 4 ounces)


  • In a large skillet, melt butter over medium-high heat. Saute onions and mushrooms until tender. Place in a 11x7-in. baking dish or 2-qt. baking dish. Sprinkle shredded cheese on top. Combine the soup, milk and soy sauce; pour over cheese. Top with bread and cheese slices. Cover and refrigerate 4 hours or overnight.
  • Remove from the refrigerator 30 minutes before baking. Loosely cover with foil and bake at 375° for 30 minutes. Uncover and bake 15-20 minutes longer or until heated through. Let stand for 5 minutes before serving.

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Average Rating:
  • slye10001000
    Oct 11, 2012

    This is so delicious!

  • CatStull
    Jun 16, 2012

    I initially got this recipe from Southern Living and it's always a winner. Excellent with steaks! A must try.

  • Isolda
    Jan 23, 2010

    My family perks up immediately when they see this casserole on the table. I have served it with just about every meat dish in my repertoire.