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Green Bean Casserole with Onion Ring Topping - This delicious casserole is made with a homemade creamy mushroom sauce and topped with crispy onion rings for a holiday side dish to remember!

Green Bean Casserole with Onion Rings

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5 from 2 reviews

This creamy green bean casserole is topped with onion rings instead of the traditional fried onions.

  • Total Time: 40 minutes
  • Yield: 4 1x


Units Scale
  • 1 tablespoon butter
  • 1/2 cup finely chopped mushrooms
  • 2 cloves garlic minced or crushed
  • 1 tablespoon flour
  • 1 cup milk
  • 1/2 cup half and half
  • 1/2 tsp. kosher salt
  • freshly ground black pepper
  • 1/2 cup shredded Italian blend cheese Swiss or monterey jack would also be great
  • 16 ounces frozen French cut green beans (not canned!)
  • 13 ounces frozen onion rings


  1. Preheat oven to 375 degrees F. Spray a 9 x 13″ baking dish with cooking spray.
  2. In a large skillet, melt butter over medium heat. Stir in mushrooms and garlic, and saute for about two minutes. Stir in flour until smooth. Stir in milk about ¼ c. at a time, stirring constantly to avoid lumps.
  3. Add half and half, salt, and pepper to taste. Bring to a simmer.
  4. Stir in cheese until melted. Stir in frozen green beans, and transfer mixture to prepared baking dish.
  5. Arrange onion rings over the top, and bake in preheated oven for 30-40 minutes.
  6. Press onion rings down into the casserole a bit about halfway through baking.
  7. Casserole is done when it is bubbly and onion rings are golden brown.


You can use all milk instead of milk and half and half if you prefer, but the sauce won’t be quite as rich.

  • Author: Andi
  • Prep Time: 10
  • Cook Time: 30