Tennessee Onions Recipe
There’s something wonderfully comforting about a simple pan of Tennessee onions baked in a 9×13 dish—soft, buttery, and caramelized to perfection. They’re the kind of effortless side that fills the kitchen with an irresistible aroma and pairs with almost anything you’re cooking, from weeknight chicken to backyard barbecue. Their versatility is what makes them a true reluctant entertainer favorite: easy to prep, always dependable, and endlessly adaptable with different cheeses, herbs, and seasonings.
Sweet Vidalia onions are baked to caramelized perfection beneath a golden blanket of melted cheeses and savory spices in this Tennessee Onions recipe. This effortless Southern side dish delivers big flavor with minimal prep – just layer, bake, and watch it disappear from your table.
This dish is incredibly versatile, working as a standout potluck side, a burger or sandwich topper, or even a hearty addition to grilled meats. The onions soften into buttery tenderness while the cheeses form a golden crust, making them irresistible when straight from the oven.
Whether served hot or warm, Tennessee Onions deliver big flavor with minimal effort – a guaranteed crowd-pleaser that’ll have you return for a second serving! One of the most popular “sides” is to serve it with a Mashed Potato Bar or a Baked Potato Bar. Guests love this option.
Why are Tennessee Onions easy to make?
The prep for this onion dish is easy: Thinly sliced onions are layered with seasoning and butter, then smothered in a trio of melty cheeses – mozzarella, sharp cheddar, and nutty Parmesan. This onion dish is baked until golden and bubbling, striking the perfect balance between sweet, savory, and just a little spicy.
Tennessee Onions are one of those simple dishes that make entertaining feel effortless. Because they are make in a 9×13 pan, you can make the ahead; pop in the oven when ready to bake, and serve! Because it feeds a crowd and stays warm straight from the oven, it’s the perfect savory side to place on the table alongside grilled meats, casseroles, or holiday favorites—easy to make, easy to serve, and always the dish guests scoop up first. 🧀🧅
Ingredients to make Tennessee Onions Recipe
- Vidalia onions: These sweet and mild Vidalia onions are the real star of this side dish. Feel free to use another variety of sweet onions, such as Walla Walla, Maui, or Texas sweet onions.
- Butter: Cut into even pats that melt evenly across the seasoned onion rings. Use unsalted butter for better control of the salt content or reduce the salt added to the seasoning mix.
- Seasonings: A combination of salt, garlic powder, oregano, dry mustard, and cayenne pepper.
- Shredded cheese: This recipe calls for a combination of freshly shredded mozzarella, sharp cheddar cheese, and parmesan cheese as the golden and bubbling topping of this dish.
How do you make Tennessee Onions?
Prep & preheat:
- Preheat the oven to 350°F and lightly coat a 9×13-inch baking dish with non-stick cooking spray.
Slice and season the onions:
- Peel the Vidalia onions and slice them into ¼-inch-thick rounds.
- Gently separate the rings into smaller clusters (about 2–3 rings per piece) to ensure even cooking. Avoid leaving them fully nested.
- Arrange the onion clusters in an even layer in the prepared baking dish.
- Whisk the seasonings together in a small bowl.
- Sprinkle the seasoning blend evenly over the onions.
Add butter and cheese:
- Distribute pats of butter evenly across the seasoned onions.
- Sprinkle the mozzarella and cheddar cheeses over the top, finishing with a generous layer of shredded Parmesan.
Bake and serve:
- Bake for 35-40 minutes, or until the cheese is golden brown and bubbly.
- Serve immediately while hot, though the dish remains delicious if served warm.
Sandy’s tips and substitutions:
- Onions: Vidalia sweet onions are ideal for Tennessee onions, but other sweet onions will work too. Try it with Walla Walla, Maui, or Texas sweet onions. Spanish onions have a bit more bite to them but are also a great pick.
- Crunchy topping: Sprinkle breadcrumbs (regular or gluten-free), crushed Ritz crackers, or lightly salted potato chips over the top of the cheese for extra golden-brown hue and for a crunchy factor
- Kick of heat: Add more spice to the onions by increasing the cayenne pepper or adding chili powder to the seasoning blend.
- Halve the Tennessee onion bake: This onion side dish serves about 10, so it’s great for potlucks or whenever you need to feed a crowd. That said, you can easily halve the recipe and bake it in a smaller dish.
- How to store the leftovers: To store Tennessee Onions, let the dish cool completely and then cover the 9×13 pan tightly with foil or transfer the onions to an airtight container. Store them in the refrigerator for up to 3–4 days.
- How to reheat this dish: Simply reheat in the oven at 325–350°F until warmed through, or microwave individual portions. The cheesy onion layers reheat well and stay flavorful, making leftovers just as delicious the next day.
Serving
These buttery, cheesy caramelized onions are the ultimate crowd-pleaser – perfect as a standalone side at potlucks or piled high on burgers and hot dogs (or bird dogs) for a flavor boost. They’re also amazingly delicious when draped over a grilled cheese sandwich or scattered on pizza. We specifically love them served on the side with Big Mac Sloppy Joes (great for game day!)
Pair them with a slow-cooked pot roast, Cashew Pesto Seared Cod Fillets, or BBQ Chicken Bacon Skewer fresh off the grill.
More onion-inspired recipes you may want to try:
- Vidalia Onion Casserole
- French Onion Soup
- Easy Caramelized Onion Crostini
- Green Beans with Bacon and Onions
Get the Recipe:
Tennessee Onions Recipe
Ingredients
- 3-4 large Vidalia sweet onions, or any sweet onions
- 4 tablespoons butter
- ½ teaspoon salt, adjust according to preference
- 1 teaspoon garlic powder
- ½ teaspoon oregano
- ½ teaspoon dry mustard
- ¼ teaspoon cayenne pepper
- 1 cup Mozzarella cheese, finely shredded
- 1 cup Sharp cheddar cheese, finely shredded
- ½ cup Parmesan cheese, finely shredded
Equipment
Instructions
- Preheat your oven to 350°F (175°C).
- Coat a 9×13-inch baking dish with non-stick cooking spray.
- Clean and peel the Vidalia sweet onions. Slice them into rounds approximately ¼ inch thick.
- Separate each onion ring into thirds so they cook evenly. Don’t leave them nested. (You don’t need to completely separate, it’s okay if 2 or 3 are attached.)
- Spread the onions evenly in the baking dish.
- In a small bowl, add the salt, garlic powder, oregano, dry mustard, and cayenne pepper. Whisk together.
- Sprinkle the onions with the mixed seasonings.
- Cut the butter into eight pats. Add these butter pats evenly across the seasoned onion rings.
- Sprinkle both cheeses evenly over the onion rings. Finish with a final topping of shredded Parmesan cheese.
- Bake for 35-40 minutes until the cheese is browned and bubbling.
- Serve right out of the oven, nice and hot, but still good if you serve warm.
- Makes a great potluck dish, or serve on burgers, hot dogs, with meat, on a grilled cheese sandwich, or on pizza
Notes
Sandy’s tips:
- Onions: Vidalia sweet onions are ideal for Tennessee onions, but other sweet onions will work too. Try it with Walla Walla, Maui, or Texas sweet onions. Spanish onions have a bit more bite to them but are also a great pick.
- Crunchy topping: Sprinkle breadcrumbs (regular or gluten-free), crushed Ritz crackers, or lightly salted potato chips over the top of the cheese for extra golden-brown hue and for a crunchy factor.
- How to store the leftovers: To store Tennessee Onions, let the dish cool completely and then cover the 9×13 pan tightly with foil or transfer the onions to an airtight container. Store them in the refrigerator for up to 3–4 days.
- How to reheat this dish: Simply reheat in the oven at 325–350°F until warmed through, or microwave individual portions. The cheesy onion layers reheat well and stay flavorful, making leftovers just as delicious the next day.
Hello and welcome to my home and table!
I’m Sandy—lover of food, family, cooking, THE BIG BOARD, travel, and bringing people together. Through great recipes and connection around the table, we become better, stronger, and more courageous people. Feasting on Life is real, and every time we do it, we grow a little more. Read more...
i was wondering if you could make this ahead? Onions might discolor? Then heat up in oven the next day?
I have not tried cooking ahead. Let me know if it works!
We LOVED this onion dish!! Will be making again soon. (Have loved every recipe of your’s!?
I would like the recipe for grilled sandwiches with onions especially what bread do you use?
Hi Sue – we just used a thicker white bread, but you can use any bread + your favorite cheese. Then add these onions at the end & sereve! Delicious!