Description
This Vidalia Onion Casserole is a creamy, cheesy baked dish that highlights the natural sweetness of Vidalia onions. Sautéed until tender and layered with a custard of half and half, eggs, and cheeses, this comforting casserole is perfect as a side dish for any meal or a savory addition to brunch.
Ingredients
Scale
Onions
- 4 large Vidalia onions, sliced (or 8 small)
Dairy and Cheese
- ½ cup butter (1 cube, plus 1–2 Tbsp for preparing the baking dish)
- 2 cups half and half
- 3 large eggs, lightly beaten
- 1 cup Sharp Cheddar cheese, shredded
- 1 cup Swiss cheese, shredded
Others
- 1 cup seasoned bread crumbs
- ½ teaspoon kosher salt
- ¼ teaspoon ground black pepper
Instructions
- Preheat Oven: Preheat your oven to 350°F (175°C) to ensure it’s ready for baking the casserole.
- Sauté Onions: In a large pan over medium heat, melt ½ cup butter. Add the sliced Vidalia onions and sauté for about 10 minutes until they become soft and translucent, releasing their natural sweetness.
- Prepare Baking Dish: Butter a 9×13 inch baking dish using 1-2 tablespoons of soft butter, spreading it evenly, then sprinkle the bottom with seasoned bread crumbs to create a flavorful base and prevent sticking.
- Layer Onions: Arrange the sautéed onions evenly over the bed of bread crumbs in the prepared baking dish.
- Make Custard Mixture: In a mixing bowl, whisk together the half and half, beaten eggs, kosher salt, and ground black pepper until fully combined and smooth.
- Pour Mixture: Gently pour the custard mixture over the onions in the baking dish, allowing it to soak through evenly.
- Add Cheese Topping: Evenly sprinkle both the Sharp Cheddar and Swiss cheeses over the top of the casserole to form a rich cheesy crust.
- Bake: Place the casserole in the preheated oven and bake for 30 minutes, or until the custard is set and the cheese is melted and slightly browned.
- Rest Before Serving: Remove the casserole from the oven and cover loosely with a towel. Let it rest for 15 minutes to allow the flavors to meld and the casserole to firm up for easier serving.
Notes
- Using Vidalia onions gives a natural sweetness that enhances the flavor of this casserole.
- You can substitute half and half with heavy cream for a richer dish or whole milk for a lighter option.
- Seasoned bread crumbs add extra flavor but plain breadcrumbs can be used with a pinch of additional seasoning.
- Allowing the casserole to rest helps it set and improves texture when slicing.
- This dish pairs beautifully with grilled meats or as a comforting vegetarian main when paired with a fresh green salad.
- Prep Time: 15 minutes
- Cook Time: 40 minutes
- Category: Side Dish
- Method: Baking
- Cuisine: American
Keywords: Vidalia onion casserole, baked onion casserole, cheesy onion bake, side dish, autumn recipe
