Tennessee Onions Recipe 

These Tennessee Onions are a cheesy, savory onion topping made with sweet Vidalia onions, fresh garlic, Worcestershire sauce, butter, and three cheeses. Baked or smoked until tender, bubbly, and golden, they’re especially good piled onto smash burgers, grilled steaks, and sandwiches.

If you’re looking for the ultimate steak or burger topping that steals the show, this Tennessee onions recipe is the one to try. I first made these to pile on top of smash burgers, and now they show up at my dinner table any time burgers are on the menu. Tennessee onions are thin onion rings tossed in garlic butter, layered with three cheeses, and baked until soft and bubbly. The flavor lands somewhere between French onion soup and one of those classic southern casseroles. Below you’ll find steps for both the oven and the smoker, so you can make them the way that fits your cook.

Why This Recipe Works

• Sweet onions turn soft and mellow. Long, slow cooking takes away the sharp bite of a raw onion and brings out their natural sweetness.
• Thin slices cook evenly. Cutting the onions ⅛ inch thick lets them melt together, while thick rings can stay firm in the center.
• Three cheeses each do a job. Sharp cheddar adds flavor, Monterey Jack gives a smooth melt, and Parmesan cheese browns into a crispy top.
• One recipe, two cooking methods. Bake it in the oven or slide it on the smoker next to your burgers for a light smoky flavor.
• Leveling up your proteins. Add to steak, over smoked tri-tip sliders, these animal style sliders, or load it up onto a smoked burger for the ultimate way to enjoy.

Ingredients for Tennessee Onions

You only need a handful of basic ingredients. Full measurements are in the recipe card at the bottom of the post.

The Onions

• Sweet Vidalia onions: Sweet onions are the star here. They have less bite and more natural sugar, so they cook down soft and mellow. Walla Walla or any other sweet onion works too.
• Swap: Regular yellow onions will work in a pinch. They have a stronger, sharper flavor, so the dish will taste less sweet.

The Garlic Butter

• Unsalted butter: Melted and poured over the onions. Using unsalted butter lets you control the salt.
• Worcestershire sauce: Adds a savory, slightly tangy depth.
• Fresh garlic: Mince it very fine so it spreads through every layer.
• Swap: No fresh garlic? Garlic salt works. Cut back on the kosher salt if you use it so the dish doesn’t turn out too salty.

The Seasonings

• Kosher salt
• Black pepper
• Smoked paprika: Adds color and a hint of smoke, even when you bake them in the oven.

The Cheeses

• Sharp cheddar: Brings the bold cheese flavor.
• Monterey Jack: Melts smooth and creamy.
• Parmesan cheese: Finely shredded so it browns on top.
• Swap: You can use mozzarella cheese in place of the Monterey Jack for a stretchier cheese pull. Shred your own cheese from the block if you can, since it melts better than pre-shredded bags.

For the Pan

• Butter or cooking spray: A light coat keeps the cheese from sticking to the dish.

How to Make Tennessee Onions

The prep is the same no matter how you cook them. The only difference is whether the dish goes into the oven or onto the smoker.

Step 1: Prep the Pan

Lightly butter a 9×13-inch baking dish or 3-quart casserole dish, or coat it with cooking spray. If you plan to smoke the onions, use a metal pan or cast iron dish instead of glass. A disposable aluminum pan works great and makes cleanup easy.

Step 2: Slice the Onions

Use a mandoline to slice the onions about ⅛ inch thick. Thin slices are the key here. Thick rings take longer to soften and can leave you with crunchy bites. Once sliced, separate the slices into individual onion rings so they spread out evenly.

Step 3: Season the Onions

Add the onion rings to a large bowl. Stir the melted butter, Worcestershire sauce, and minced garlic together, then pour it over the onions. Add the salt, black pepper, and smoked paprika. Toss gently until every ring is coated.

Step 4: Mix the Cheeses

Combine the cheddar, Monterey Jack, and Parmesan in a bowl. Mixing them first means every bite gets a little of each cheese.

Step 5: Layer It Up

Spread half of the onions evenly into the dish. Sprinkle half of the cheese mixture over them. Add the rest of the onions, then finish with the remaining cheese spread across the top of the onions.

How to Bake Tennessee Onions

1. Preheat your oven to 350°F.
2. Bake uncovered for 45 to 55 minutes. The onions are done when they are completely tender and the cheese is melted, bubbling, and deeply browned in spots.
3. For an extra-browned top, broil for 2 to 3 minutes at the end. Stay close and watch it, because cheese can go from golden to burnt fast.

How to Smoke Tennessee Onions

1. Preheat your smoker to 350°F. A mild wood like apple, cherry, or pecan pairs well with the sweet onions and won’t overpower the cheese.
2. Set the dish on the grates uncovered and close the lid.
3. Smoke for 45 to 55 minutes, until the onions are completely tender and the cheese is bubbling and browned in spots. Smokers can run hotter or cooler than the dial says, so check the onions with a fork rather than going by time alone.
4. For a more browned top, raise the smoker temperature to about 400°F for the final few minutes.

If you’re already firing up the smoker for burgers, this is an easy way to get your side dish done at the same time.

Step 6: Let It Rest

Let the Tennessee onions rest for 10 minutes before serving. As the butter melts into the cheese and everything cools slightly, the cheese sets up. That way, the onions and cheese stay together when you scoop them onto a burger instead of sliding off.

Tips and Variations

Tips for the Best Tennessee Onions

• Use a mandoline guard. Onions are slippery, so always use the hand guard when slicing.
• Separate every ring. Clumps of slices cook unevenly. Pulling the rings apart helps the butter and cheese reach every piece.
• Don’t cover the dish. Leaving it uncovered lets extra moisture cook off and helps the cheese brown.
• Making these for the first time? Start checking at 45 minutes. Ovens and smokers vary, and tender onions matter more than the clock.

Variations

• Add bacon: Sprinkle crumbled cooked bacon between the layers.
• Bring some heat: Add sliced jalapeños or a pinch of cayenne to the butter mixture.
• Change the cheese: Swap in mozzarella cheese, pepper Jack, or smoked Gouda.

Make Ahead and Storage

• Make ahead: Slice the onions and shred the cheese up to a day ahead. Store them separately in the fridge, then season and layer right before cooking.
• Storage: Let leftovers cool, then keep them in an airtight container in the fridge for 3 to 4 days.
• Reheating: Warm them in a 350°F oven until hot, or reheat single portions in the microwave.

What to Pair With Tennessee Onions

These cheesy onions work as a topping or a side dish. Here are a few favorite ways to serve them:

• Smash burgers: Scoop a big spoonful right on top of the patty. This is how I first served them, and it’s still my favorite.
• Grilled steak: Spoon them over a ribeye or strip steak like a steakhouse topping, or with this reverse seared tomahawk steak.
• Smoked brisket or pulled pork: Serve them on the side or pile them onto a sandwich. It would be incredible on these pulled pork sliders too.
• Brats and hot dogs: A cheesy upgrade from plain grilled onions.
• Grilled pork chops or chicken: A rich side that rounds out a simple protein. I love it with these blackened pork chops, these grilled tomahawk pork chops, or with some smoked beer can chicken.

Tennessee Onions FAQ

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