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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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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
Prep Time: 10 minutes
Cook Time: 50 minutes
Resting Time: 5 minutes
Total Time: 1 hour 5 minutes
Servings: 6
Calories: 340kcal
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