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Cheesy Onion Casserole Recipe

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★★★★★

4.7 from 53 reviews

This Cheesy Onion Casserole is a comforting, savory dish featuring sautéed sweet onions layered with creamy Swiss cheese and a rich chicken soup sauce, all topped with toasted French bread slices and baked to golden perfection. Perfect as a hearty side or a satisfying vegetarian meal, this casserole combines bold flavors and a delightful texture for a quick, easy dinner option.

Ingredients

Scale

Primary Ingredients

  • 2–3 tablespoons butter or margarine
  • 3 large sweet onions or 4 medium white or yellow onions
  • 2 cups shredded Swiss cheese (8 oz.)
  • 1 can cream of chicken soup, undiluted
  • 2/3 cup milk
  • 1 teaspoon soy sauce
  • 8 slices French bread

Instructions

  1. Slice Onions: Slice the onions finely, trying to minimize tears as you work. This recipe uses a large quantity of onions, so take your time for the best texture.
  2. Sauté Onions: Melt 2-3 tablespoons of butter in a sauté pan over medium heat. Add the sliced onions and cook until they become clear and tender, allowing slight browning for added flavor. This process will take about 10-15 minutes.
  3. Layer Ingredients: In a shallow 2-quart casserole dish, spread the sautéed onions evenly. Sprinkle two-thirds of the shredded Swiss cheese over the onions, and season with freshly ground pepper to taste.
  4. Prepare Sauce: In a saucepan, combine the undiluted can of cream of chicken soup, 2/3 cup milk, and 1 teaspoon soy sauce. Heat gently while stirring until the mixture is smooth and well blended.
  5. Combine and Top: Pour the warm soup mixture evenly over the onion and cheese layers in the casserole. Stir gently to combine the ingredients slightly, then arrange the French bread slices over the top in a single layer.
  6. First Bake: Place the uncovered casserole into a preheated oven at 350°F (175°C) and bake for 15 minutes. The bread should become toasted and golden.
  7. Final Layer and Bake: After 15 minutes, push the toasted bread slices slightly into the sauce. Sprinkle the remaining cheese evenly on top and return the casserole to the oven. Bake for an additional 15 minutes until the cheese is melted and bubbly, and the casserole is heated through.
  8. Serve: Remove from the oven and allow to cool for a few minutes before serving hot. Enjoy this rich, cheesy, and flavorful casserole as a comforting meal.

Notes

  • You can substitute the cream of chicken soup with cream of mushroom soup for a vegetarian version if milk is suitable.
  • Using butter instead of margarine will add a richer flavor.
  • Sauté onions thoroughly for the best sweetness and to reduce any sharpness.
  • French bread slices can be lightly buttered before baking for extra crispness.
  • To make it gluten-free, use gluten-free bread and verify that the soup is gluten-free.
  • Leftovers can be stored in the refrigerator for up to 3 days and reheated in the oven for best texture.

Keywords: Cheesy Onion Casserole, Swiss Cheese Casserole, Comfort Food, Onion Casserole, Baked Casserole, Easy Dinner Recipe

Find it online: https://cookcrisis.com/cheesy-onion-casserole-recipe/