What type of onions work best for Tennessee Onions?

Sweet onions like Vidalia , Walla Walla, or Maui onions are the best choices for Tennessee Onions. Their natural sweetness balances beautifully with the savory cheeses and buttery texture. Avoid using red or white onions, as they can be too sharp or bitter for this style of dish.

Can I make Tennessee Onions ahead of time?

Yes, Tennessee Onions are great for meal prep. Assemble the entire dish up to 24 hours in advance and store it covered in the fridge. When ready to bake, let it sit at room temperature for 20 minutes and then bake as directed, adding a few extra minutes if needed.

Are Tennessee Onions gluten-free?

Tennessee Onions are naturally gluten-free, making them a fantastic side dish for those avoiding gluten. Just be sure to check that all cheeses and any added seasonings are certified gluten-free, as some pre-shredded cheeses may contain anti-caking agents with gluten.

Tennessee Onions – Best Cheesy Side Dish

Name: Tennessee Onions
Prep time: 10 min
Cook time: 30 min
Total time: 40 min
Cuisine: Southern
Ingredients: 4 large Vidalia onions: sliced into 1/2-inch rings for sweet, tender texture; 4 tablespoons salted butter: adds richness and helps caramelize the onions; 1 cup shredded mozzarella cheese: for creaminess and meltability; 1 cup shredded sharp cheddar cheese: for bold, tangy flavor; 1/2 cup grated Parmesan cheese: adds salty, nutty depth and a golden top; Salt and pepper to taste: essential for seasoning; 1 teaspoon dried Italian herbs (optional): for added aroma and herbal complexity

Description

Tennessee Onions are a Southern classic — sweet onions baked to tender perfection under layers of melty cheddar, mozzarella, and Parmesan cheese. This comforting and cheesy side dish is perfect for barbecues, holiday meals, or any time you want a crowd-pleasing, budget-friendly addition to your dinner table.

Ingredients

Scale

4 large Vidalia onions: sliced into 1/2-inch rings for sweet, tender texture
4 tablespoons salted butter: adds richness and helps caramelize the onions
1 cup shredded mozzarella cheese: for creaminess and meltability
1 cup shredded sharp cheddar cheese: for bold, tangy flavor
1/2 cup grated Parmesan cheese: adds salty, nutty depth and a golden top
Salt and pepper to taste: essential for seasoning
1 teaspoon dried Italian herbs (optional): for added aroma and herbal complexity

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Instructions

Preheat your oven to 375°F (190°C).
Peel and slice the Vidalia onions into 1/2-inch thick rings. Separate the rings and layer them evenly in a greased 9×13-inch baking dish.
Dot the onions with small cubes or pats of salted butter evenly across the top.
Season with salt, pepper, and optional dried Italian herbs.
Top with shredded mozzarella cheese, then cheddar cheese, and finish with grated Parmesan.
Bake uncovered for 25–30 minutes, or until the onions are tender and the cheese is bubbly and golden brown.
Let the dish rest for 5 minutes before serving to allow the flavors to meld.

Notes

Use sweet onions like Vidalia for best results; avoid red or white onions.
Pre-shredded cheese works, but fresh-shredded cheese melts better and tastes richer.
This dish can be made ahead of time and stored in the fridge before baking.
Great for potlucks, grilling sides, or vegetarian main dishes.

Prep Time: 10 minutes
Cook Time: 30 minutes
Category: Side Dish
Method: Baking
Cuisine: Southern

Nutrition

Serving Size: 1 serving
Calories: 260
Sugar: 6g
Sodium: 420mg
Fat: 20g
Saturated Fat: 12g
Unsaturated Fat: 6g
Trans Fat: 0g
Carbohydrates: 12g
Fiber: 2g
Protein: 9g
Cholesterol: 45mg