Description
This Tennessee Onions recipe is a simple, comforting casserole featuring sweet onions baked with layers of gooey cheese and butter. It’s an easy, crowd-pleasing side dish perfect for holidays, potlucks, or weeknight dinners.
Ingredients
- 3–4 large sweet onions (about 2 lbs), sliced into 1/2-inch thick rounds
- 2 cups (8 oz) sharp cheddar cheese, shredded
- 1 cup (4 oz) mozzarella cheese, shredded
- 1/2 cup (2 oz) Parmesan cheese, grated
- 1/2 cup (1 stick) butter, melted
- 1 teaspoon garlic powder
- 1/2 teaspoon salt (or to taste)
- 1/4 teaspoon black pepper (or to taste
Instructions
- Preheat your oven to 350°F (175°C). Grease a 2-quart casserole dish with butter or cooking spray.
- Peel and slice the onions into thick 1/2-inch rounds. Separate the rings and layer them evenly in the casserole dish.
- Sprinkle the onions with salt, pepper, and garlic powder. Pour the melted butter evenly over the onions, making sure it gets into all the layers.
- Sprinkle the cheddar cheese over the onions, followed by the mozzarella, then the Parmesan, creating a generous cheese layer.
- Bake uncovered for 35-40 minutes, until the top is golden and bubbly and the onions are tender when pierced with a fork. If the top browns too quickly, cover loosely with foil for the last 10 minutes.
- Let the casserole rest for 5 minutes before serving to allow the cheese to set.
Notes
For best results, use sweet onions like Vidalia or Walla Walla. Shred your own cheese for optimal melting. Let the casserole rest before serving for easier scooping. For a crispy top, broil for 2 minutes at the end. You can prep the dish ahead and refrigerate before baking. Add bacon, herbs, or extra veggies for variations. This recipe is naturally gluten-free—just check your cheese labels if sensitive.
- Prep Time: 15 minutes
- Cook Time: 40 minutes
- Category: Side Dish
- Cuisine: Southern
Nutrition
- Serving Size: 1/8 of casserole
- Calories: 210
- Sugar: 5
- Sodium: 350
- Fat: 13
- Saturated Fat: 8
- Carbohydrates: 14
- Fiber: 2
- Protein: 7
Keywords: Tennessee onions, cheesy onions, onion casserole, Southern side dish, easy casserole, gluten-free side, comfort food, potluck recipe, Vidalia onions, baked onions