Tennessee Onions are the ultimate Southern comfort-food side dish! Thick slices of sweet onions are layered in a baking dish, generously coated with butter, herbs, and garlic, then topped with a delicious combination of melted cheeses. As they bake, the onions become tender, caramelized around the edges, and incredibly flavorful, while the cheese turns golden and bubbly.
This easy recipe requires just a handful of simple ingredients and makes a wonderful side dish for roasted chicken, grilled meats, steak, burgers, or a traditional Southern dinner.
🛒 Ingredients
3–4 large sweet onions, such as Vidalia onions
4 tablespoons unsalted butter, melted
1 teaspoon garlic powder
1 teaspoon Italian seasoning
½ teaspoon salt
½ teaspoon black pepper
1 cup shredded mozzarella cheese
½ cup shredded cheddar cheese
¼ cup grated Parmesan cheese
1 tablespoon fresh chopped parsley
👩🍳 Instructions
- Prepare the onions
Preheat your oven to 400°F (200°C).
Peel the onions and slice them into thick rounds, about ½-inch thick. Carefully separate the slices into individual rings or leave some smaller layers together. - Arrange in the baking dish
Lightly grease a baking dish with butter or cooking spray. Arrange the onion slices in an even layer, slightly overlapping them if necessary. - Add the seasoning
Drizzle the melted butter evenly over the onions. Sprinkle with garlic powder, Italian seasoning, salt, and black pepper. - Add the cheese
Sprinkle the mozzarella, cheddar, and Parmesan evenly over the onions, making sure most of the surface is covered. - Bake
Place the dish in the preheated oven and bake for approximately 25–30 minutes, or until the onions are tender and the cheese is completely melted and bubbling.
For a more golden, caramelized cheese topping, place the dish under the broiler for 1–2 minutes at the end. Watch carefully so the cheese doesn’t burn. - Garnish and serve
Remove from the oven and let the onions rest for a few minutes. Sprinkle with freshly chopped parsley and serve warm.
⭐ Tips for the Best Tennessee Onions
Use sweet onions for the best flavor and texture.
Cut the onions thick enough so they don’t completely disappear during baking.
Don’t skip the Parmesan—it adds a delicious savory flavor to the cheese topping.
For extra richness, add a little more butter before baking.
Let the dish rest for a few minutes before serving so the cheese can set slightly.
🍽️ What to Serve with Tennessee Onions
These cheesy baked onions pair beautifully with:
Grilled steak
Roasted chicken
BBQ ribs
Burgers
Grilled pork chops
Roast beef
Mashed potatoes
Green beans
⏱️ Recipe Details
Prep Time: 10 minutes
Cook Time: 25–30 minutes
Total Time: About 40 minutes
Servings: 6
Category: Side Dish
Cuisine: Southern American
Tennessee Onions are best served hot, straight from the oven, when the cheese is still melted, bubbly, and golden.