Sweet Onion Casserole

Step 4: Prepare the Creamy Mixture

While the onions caramelize, mix together the heavy cream, sour cream, salt, pepper, and thyme in a bowl. This creamy mixture will coat the onions and create a rich, indulgent texture in the casserole.

Step 5: Layer the Casserole

Once the onions are caramelized, transfer them to the prepared baking dish. Pour the cream mixture evenly over the onions. Sprinkle half of the shredded Gruyère or cheddar cheese over the top and gently stir to combine, ensuring every onion slice is coated.

Step 6: Add the Topping

In a small bowl, combine the panko breadcrumbs with Parmesan cheese and olive oil. This mixture will give the casserole a crisp, golden topping. Sprinkle it evenly over the casserole, covering the creamy onions underneath.

Step 7: Bake to Perfection

Place the casserole in the preheated oven and bake for 25-30 minutes, or until the topping is golden brown and crispy. The cream should be bubbling slightly around the edges.

Step 8: Serve and Enjoy

Remove the casserole from the oven and let it cool for 5 minutes before serving. This allows the creamy sauce to set slightly, making it easier to scoop. Garnish with a few fresh thyme leaves for a beautiful presentation.

Tips for Success

• Sweet onions are key: Regular onions will work, but sweet onions provide the best flavor and natural caramelization.
• Do not rush caramelization: Cooking onions slowly ensures maximum sweetness and depth of flavor.
• Cheese variety: Gruyère adds a nutty richness, while cheddar provides a sharper flavor. Mixing both can give a balanced taste.
• Make ahead: You can prepare the casserole a day in advance, cover it with foil, and bake it just before serving.

The Sweet Onion Casserole is more than just a side—it’s a comforting, flavorful dish that elevates any meal. With tender, caramelized onions, creamy richness, and a golden breadcrumb topping, this recipe is sure to become a favorite for family dinners and holiday gatherings alike.

If you want, I can also create a shortcut version of this casserole that uses fewer ingredients but keeps the same sweet, creamy flavor—perfect for busy weeknights.

Do you want me to do that?