If you’re looking for a dish that brings together comfort, flavor, and a touch of Southern charm all in one pot, you’ve got to try this One-Dish Tennessee Onions Recipe. It’s a beautifully layered combination of tender, sweet onions sautéed to perfection, mixed with creamy cheese, fresh tomatoes, and seasoned rice. This recipe hits all the right notes of warmth and heartiness, making it a standout centerpiece for any meal. Its simplicity is almost deceptive because the flavor it delivers will have everyone asking for seconds.

Ingredients You’ll Need
These ingredients are straightforward but play a vital role in crafting the soulful character of the dish. Each one contributes a unique texture, flavor, or color that elevates the final result into a perfect harmony of tastes.
- 4 large onions, peeled and sliced: The star of the dish, providing sweetness and body when sautéed gently.
- 1/4 cup butter: Adds rich, creamy flavor and helps soften the onions beautifully.
- 1 cup cooked rice: A neutral base that absorbs the flavors and offers comforting texture.
- 1 cup shredded cheese (cheddar or Monterey Jack): Melted cheese brings gooey, savory goodness that ties everything together.
- 1 cup diced tomatoes (fresh or canned): Adds a burst of juiciness and subtle acidity to balance the dish.
- 1 teaspoon garlic powder: Enhances depth of flavor with a gentle garlic aroma.
- 1 teaspoon onion powder: Boosts onion flavor even more, making it beautifully aromatic.
- 1 teaspoon dried oregano: Gives that hint of earthy, herbal warmth that complements the Southern vibe.
- Salt and pepper to taste: Essential seasonings to lift all the flavors.
- 1/2 cup breadcrumbs (optional topping): Adds a delightful crunch that contrasts the creamy interior.
- Fresh parsley for garnish (optional): For a pop of fresh color and a mild herbal note.
How to Make One-Dish Tennessee Onions Recipe
Step 1: Preheat and Prepare
Start by preheating your oven to 350°F (175°C). This ensures the dish will bake evenly once everything is assembled. Having the heat ready makes the whole cooking process smooth and hassle-free.
Step 2: Sauté the Onions
In a large skillet, melt the butter over medium heat. Add the sliced onions and gently sauté them for 10 to 12 minutes until they become soft and translucent. This slow cooking unlocks their natural sweetness and softens their texture, which is key for the recipe’s base flavor.
Step 3: Mix the Rice and Flavors
While the onions are cooking, combine the cooked rice, shredded cheese, diced tomatoes, garlic powder, onion powder, oregano, salt, and pepper in a mixing bowl. Stir everything thoroughly until all the ingredients are evenly distributed. This step creates a rich and flavorful filler that complements the onions perfectly.
Step 4: Combine Onions with the Rice Mixture
Once your onions are perfectly softened, fold them into the rice and cheese mixture. Mixing them ensures the sweet, buttery onions are woven throughout, allowing every bite to have that comforting, layered texture.
Step 5: Bake to Perfection
Transfer the combined mixture into a greased 9×13 inch baking dish. Spread it out evenly so it cooks uniformly. If you like a bit of crunch, sprinkle breadcrumbs on top before placing it in the oven. Bake for 25 to 30 minutes until the cheese melts into a bubbly, golden crown that’s as pleasing to the eye as it is to the palate.
Step 6: Cooling and Garnishing
Once baked, let the dish cool for a few minutes. This resting period allows the ingredients to settle and makes serving easier. Before presenting your One-Dish Tennessee Onions Recipe, garnish with fresh parsley for a lovely touch of color and an inviting herbal aroma.
How to Serve One-Dish Tennessee Onions Recipe

Garnishes
Fresh parsley is a simple garnish that adds a hint of brightness both visually and in flavor. For extra indulgence, try a light drizzle of sour cream or a sprinkle of extra shredded cheese right before serving to amp up the richness.
Side Dishes
This dish shines on its own as a hearty main, but pairing it with crisp green vegetables like steamed broccoli or a fresh garden salad balances the comfort with some freshness. Saying yes to a side of grilled chicken or roasted sausage also works wonders if you want a protein boost.
Creative Ways to Present
To suit different occasions, try serving this dish in individual ramekins for a charming touch, or layer it in a clear casserole for a rustic, inviting presentation. Adding a swirl of spicy tomato sauce on top can bring a little kick and vibrant color to the table.
Make Ahead and Storage
Storing Leftovers
Leftovers can be stored in an airtight container in the refrigerator for up to 3 days. The flavors actually deepen after resting overnight, making for an even tastier meal the next day.
Freezing
One-Dish Tennessee Onions Recipe freezes beautifully. Just cool it completely, then cover tightly with plastic wrap and foil or place in a freezer-safe container. It will keep well for up to 2 months without losing its delicious texture.
Reheating
Reheat leftovers in the oven at 325°F until warmed through, about 15-20 minutes, or microwave individual portions covered to maintain moisture. Adding a few extra sprinkles of cheese while reheating is a nice way to refresh the dish’s cheesiness.
FAQs
Can I use different types of cheese in this recipe?
Absolutely! Cheddar and Monterey Jack are classic choices, but feel free to experiment with mozzarella, pepper jack, or even a blend for varied flavor and meltiness.
Is it necessary to use cooked rice, or can I use uncooked rice?
It’s best to use cooked rice here since the baking time isn’t long enough to cook raw rice thoroughly. Use day-old or freshly cooked and cooled rice for the best texture.
Can I make this recipe vegetarian?
This recipe is naturally vegetarian as written. Just ensure any cheese you use fits your dietary preferences, especially if avoiding animal rennet.
What can I substitute for butter if I want a dairy-free version?
You can replace butter with olive oil or a plant-based margarine. Both options will still sauté the onions nicely while keeping the recipe dairy-free.
Will this recipe work with other vegetables?
Yes! You can try adding sautéed bell peppers, mushrooms, or even cooked spinach to mix up the flavors and nutritional profile without losing the dish’s comforting feel.
Final Thoughts
There’s something truly special about a dish that feels like a hug in a bowl, and the One-Dish Tennessee Onions Recipe does just that. It’s approachable, bursting with layers of flavor, and perfect for sharing with family or friends. If you’re craving a meal that’s both nostalgic and effortlessly delicious, this recipe deserves a spot in your regular rotation. Go ahead, give it a try – your taste buds will thank you!
Print
One-Dish Tennessee Onions Recipe
- Prep Time: 0h 15m
- Cook Time: 0h 30m
- Total Time: 0h 45m
- Yield: 6 servings
- Category: Casserole
- Method: Baking
- Cuisine: American Southern
Description
One-Dish Tennessee Onions is a comforting baked casserole featuring tender sautéed onions combined with savory rice, melted cheese, and diced tomatoes, seasoned with garlic, onion powder, and oregano. Finished with a crunchy breadcrumb topping and fresh parsley garnish, this hearty dish offers a delightful blend of creamy and crispy textures, perfect as a side or a light main course.
Ingredients
Main Ingredients
- 4 large onions, peeled and sliced
- 1/4 cup butter
- 1 cup cooked rice
- 1 cup shredded cheese (cheddar or Monterey Jack)
- 1 cup diced tomatoes (fresh or canned)
- 1 teaspoon garlic powder
- 1 teaspoon onion powder
- 1 teaspoon dried oregano
- Salt and pepper to taste
Topping and Garnish
- 1/2 cup breadcrumbs (optional for topping)
- Fresh parsley for garnish (optional)
Instructions
- Preheat the Oven: Preheat your oven to 350°F (175°C) to ensure it is ready to bake the casserole evenly.
- Sauté Onions: In a large skillet over medium heat, melt the butter and add the sliced onions. Cook for 10-12 minutes until the onions are soft and translucent, stirring occasionally for even cooking.
- Prepare Rice Mixture: In a mixing bowl, combine the cooked rice, shredded cheese, diced tomatoes, garlic powder, onion powder, dried oregano, salt, and pepper. Mix thoroughly to blend all the flavors.
- Combine Onions and Rice Mixture: Add the sautéed onions into the rice and cheese mixture, stirring well to incorporate.
- Transfer to Baking Dish: Grease a 9×13 inch baking dish and spread the mixture evenly inside.
- Add Breadcrumb Topping: If using, sprinkle the breadcrumbs evenly over the top to create a crunchy crust.
- Bake: Place the dish in the preheated oven and bake for 25-30 minutes until the cheese is melted, bubbly, and the top is lightly golden brown.
- Cool Slightly: Remove the dish from the oven and allow it to cool for a few minutes before serving to let it set.
- Garnish and Serve: Garnish with fresh parsley if desired and serve warm for a delicious one-dish meal.
Notes
- You can substitute the shredded cheese with your favorite meltable cheese such as mozzarella or pepper jack for a different flavor.
- Using fresh diced tomatoes will give a fresher taste, but canned tomatoes work well too.
- Breadcrumb topping adds a nice crunchy texture but can be omitted for a softer topping.
- For extra flavor, consider adding cooked bacon or sausage into the rice mixture.
- This dish can be prepared ahead and refrigerated before baking; just add a few extra minutes to the bake time if cold from the fridge.

