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–+ servings
Golden-brown baked Tennessee onions in a blue dish topped with melted cheese and fresh thyme sprigs.

Tennessee Onions

Sweet, buttery, cheesy baked Tennessee Onions that melt in your mouth. A simple Southern side dish that turns humble onions into pure comfort food. Perfect for BBQs, holidays, or any meal that needs a crowd-pleasing side.
5 from 1 vote
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Prep Time 10 minutes
Cook Time 50 minutes
Resting Time 5 minutes
Total Time 1 hour 5 minutes
Servings: 6
Calories: 340kcal
Course: Side Dish
Cuisine: American
Keyword: Tennessee Onions, Tennessee onions casserole, Tennessee onions delish, Tennessee onions in air fryer, Tennessee onions recipe easy, Tennessee onions recipes, Traditional Tennessee onions
Cost: $9

🍳 Equipment

  • 1 9x13 inch baking dish (Glass or metal both work)
  • 1 Sharp knife (For slicing onions evenly)
  • 1 Cutting board
  • 1 Foil (To cover dish while baking)
  • 1 Measuring cups/spoons (For ingredients and seasonings)

🛒 Ingredients

  • 3–4 large Sweet onions - Vidalia or Walla Walla work best
  • ½ cup Butter - Melted
  • 2 cups Mozzarella cheese - Shredded
  • 1 cup Parmesan cheese - Grated
  • 1 teaspoon Garlic powder
  • 1 teaspoon Salt
  • ½ teaspoon Black pepper - Freshly ground
  • 1 tablespoon Worcestershire sauce - Optional but adds flavor
  • Italian seasoning - Optional
  • Red pepper flakes - Optional, for heat
  • Fresh parsley - Optional, for garnish

📋 Instructions

  • Preheat oven to 350°F (175°C). Peel and slice onions into ½-inch rings. Separate and layer them in a 9x13 baking dish.
  • Pour melted butter over onions. Sprinkle garlic powder, salt, and pepper. Add Worcestershire sauce if using. Toss gently to coat.
  • Spread mozzarella and Parmesan evenly over onions. Cover completely for a rich, cheesy layer.
  • Cover dish with foil and bake for 35–40 minutes until onions start to soften.
  • Remove foil and bake another 10–15 minutes until cheese is golden and bubbly.
  • Let stand 5 minutes before serving. Garnish with parsley if desired.

📝 Notes

Nutrition information is automatically calculated and should be considered an approximation. Actual values may vary based on specific ingredients used and portion sizes.

🥗 Nutrition

Serving: 180g | Calories: 340kcal | Carbohydrates: 13g | Protein: 13g | Fat: 27g | Saturated Fat: 16g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 7g | Cholesterol: 65mg | Sodium: 720mg | Potassium: 220mg | Fiber: 2g | Sugar: 7g | Vitamin A: 850IU | Vitamin C: 8mg | Calcium: 310mg | Iron: 0.7mg