Cheesy Onion Casserole Recipe

Introduction

This Cheesy Onion Casserole is a comforting dish that combines sweet, sautéed onions with creamy cheese and a crispy bread topping. It’s quick to prepare and perfect for a cozy meal or as a hearty side dish.

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. Step 1: Slice the onions thinly. Melt the butter in a sauté pan over medium heat, then add the onions. Cook, stirring occasionally, until the onions are clear and slightly browned.
2. Step 2: In a shallow 2-quart casserole dish, layer the sautéed onions with two-thirds of the shredded Swiss cheese. Season with pepper to taste.
3. Step 3: In a saucepan, combine the cream of chicken soup, milk, and soy sauce. Heat gently while stirring until blended. Pour this mixture over the onion and cheese layers in the casserole. Stir gently to mix.
4. Step 4: Arrange the French bread slices on top of the casserole. Bake uncovered at 350°F for 15 minutes, until the bread is toasted on top.
5. Step 5: Push the toasted bread slices down under the sauce, then sprinkle the remaining cheese over the top. Return the casserole to the oven and bake for an additional 15 minutes.

Tips & Variations

• For a vegetarian version, substitute the cream of chicken soup with cream of mushroom or cream of celery soup.
• Try adding a sprinkle of fresh thyme or rosemary to enhance the onion flavor.
• Use a sharp or gruyere cheese instead of Swiss for a different taste.

Storage

Store any leftovers in an airtight container in the refrigerator for up to 3 days. Reheat gently in the oven at 350°F until warmed through to keep the bread topping crisp.

How to Serve

Serve this delicious recipe with your favorite sides.

FAQs

Can I use other types of bread for the topping?

Yes, crusty bread like sourdough or a baguette works well. Just slice and toast as directed.

Is it possible to make this casserole ahead of time?

Absolutely! Assemble the casserole up to the baking step, cover, and refrigerate for up to 24 hours. Bake as directed, adding a few extra minutes if baking from cold.

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.

• Author: Marco
• Prep Time: 20 minutes
• Cook Time: 30 minutes
• Total Time: 50 minutes
• Yield: 6 servings 1x
• Category: Casserole
• Method: Baking
• Cuisine: American

Ingredients

Scale 1x2x3x

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