Tennessee Onions – A Southern Cheesy Onion Classic

Jump to Recipe Print Recipe

If you’ve never had Tennessee onions, you’re about to discover one of the South’s most comforting and underrated side dishes. Made with thick slices of sweet onions baked in butter and covered in melted cheese, this recipe is rich, savory, and surprisingly simple.

Tennessee onions aren’t fancy. They don’t rely on complicated techniques or hard-to-find ingredients. Instead, they celebrate what Southern cooking does best: transforming humble pantry staples into something unforgettable.

This dish is perfect served alongside grilled meats, holiday roasts, or even as a stand-alone comfort food for onion lovers. The onions soften and sweeten as they bake, while the cheese forms a golden, bubbly crust that’s impossible to resist.

What Are Tennessee Onions?

Tennessee onions are a Southern baked onion casserole traditionally made with sweet onions, butter, and plenty of cheese. Unlike onion rings or fried onions, this dish is baked slowly, allowing the onions to caramelize gently while staying tender and juicy.

Though the exact origin is debated, Tennessee onions gained popularity at barbecues, potlucks, and church suppers throughout the South. They’re often compared to funeral potatoes or scalloped potatoes — simple, indulgent, and meant to feed a crowd.

Why You’ll Love This Recipe

  • Uses just a few ingredients
  • Naturally sweet and savory
  • Perfect for holidays and cookouts
  • Easy to prep ahead
  • Crowd-pleasing comfort food

If you love onions, this dish will become a staple.

Ingredients

  • 4 large sweet onions (Vidalia or Walla Walla)
  • 2 cups shredded cheddar cheese
  • 1 cup shredded mozzarella cheese
  • ½ cup unsalted butter, sliced
  • 1 teaspoon garlic powder
  • ½ teaspoon salt
  • ½ teaspoon black pepper

Instructions

  1. Preheat the oven
    Preheat your oven to 350°F (175°C). Lightly grease a baking dish.
  2. Slice the onions
    Peel onions and slice into thick rings or half-moons, about ¼-inch thick.
  3. Layer the onions
    Spread the onion slices evenly in the prepared baking dish.
  4. Season
    Sprinkle garlic powder, salt, and black pepper evenly over the onions.
  5. Add butter
    Distribute butter slices evenly across the onions.
  6. Add cheese
    Sprinkle cheddar and mozzarella evenly over the top.
  7. Bake
    Cover loosely with foil and bake for 30 minutes.
  8. Uncover and finish
    Remove foil and bake an additional 20–25 minutes until bubbly and lightly golden.
  9. Rest and serve
    Let rest for 5 minutes before serving.

Tennessee Onions

A classic Southern side dish made with sweet onions baked in butter and topped with melted cheese.
Print Recipe Pin Recipe
Prep Time 10 minutes
Cook Time 55 minutes
Total Time 1 hour 5 minutes
Servings: 6 servings
Course: Side Dish
Cuisine: American, Southern
Calories: 310

Ingredients
  

  • 4 sweet onions sliced
  • 2 cups shredded cheddar cheese
  • 1 cup shredded mozzarella cheese
  • 0.5 cup unsalted butter sliced

Equipment

  • Baking dish
  • Knife
  • Cutting board

Method
 

  1. Preheat oven to 350°F and grease baking dish.
  2. Slice onions and layer in baking dish.
  3. Season onions with garlic powder, salt, and pepper.
  4. Top with butter and shredded cheese.
  5. Cover and bake 30 minutes.
  6. Uncover and bake 20–25 minutes until golden.

Notes

Use sweet onions for best flavor.

Pro Tips for Perfect Tennessee Onions

  • Use sweet onions for best flavor
  • Slice onions evenly for uniform cooking
  • Cover first to soften onions, then uncover to brown cheese
  • Let rest briefly before serving

Variations

Extra Cheesy Tennessee Onions
Add Monterey Jack or Colby cheese.

Spicy Version
Add crushed red pepper flakes or sliced jalapeños.

Herb-Infused
Sprinkle fresh thyme or rosemary before baking.

Low-Carb Friendly
Naturally low-carb — perfect for keto-style meals.

What to Serve with Tennessee Onions

  • Grilled steak or chicken
  • BBQ ribs or pulled pork
  • Holiday ham or turkey
  • Burgers and hot dogs
  • Meatloaf or roast beef

They also pair beautifully with simple green salads to balance the richness.

Make-Ahead & Storage

Tennessee onions can be assembled up to 24 hours ahead and baked when ready. Store leftovers covered in the refrigerator for up to 3 days. Reheat gently in the oven.

Why This Recipe Works

The slow baking process allows onions to release moisture and caramelize naturally, while the cheese melts into a savory crust. Butter adds richness and ensures the onions remain tender rather than drying out.

This dish proves that sometimes the simplest recipes are the most memorable.

Leave a Reply