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Heavenly Onion Casserole

3 reviews
Test Kitchen Approved
Total Time

Prep: 15 min. + chilling Bake: 45 min.

Makes

6-8 servings

Updated: Oct. 03, 2022
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
Heavenly Onion Casserole
Heavenly Onion Casserole Recipe photo by Taste of Home
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Ingredients

  • 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)

Directions

  1. 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.
  2. 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.