Savor the Southern Charm: Tennessee Onions
Embark on a culinary journey to the heart of Southern cooking with this Tennessee Onions recipe, a delightful casserole that combines sweet onions with rich, cheesy goodness. Perfect for a cozy family dinner or as a standout side at your next potluck, this dish brings a touch of Southern hospitality right to your table.

Ideal for anyone looking to impress with minimal effort, this recipe is straightforward yet yields incredibly flavorful results. Ready to add a new favorite to your recipe collection? Let’s get started with this simple and rewarding dish.
Rich and Cheesy: Your New Favorite Onion Casserole
This Tennessee Onions casserole isn’t just about the sweet onions; it's about how they meld beautifully with the creamy, smoky flavors of cheddar and Gouda. This dish is a deep dive into comfort food, easily mastered with a few key steps.
Here’s how to create a casserole that’s as inviting as it is delicious, complete with tips to make sure it’s perfect every time.
Pro Tips for Perfect Tennessee Onions:
- Evenly Sliced Onions: Ensure your onions are cut into uniform slices to promote even cooking.
- Proper Seasoning: Layer the herbs and spices evenly to fully enhance the natural sweetness of the onions.
- Cheese Choices: Using a combination of mild Cheddar and smoked Gouda offers a balance of flavor and creaminess.
- Cover While Baking: Keep the dish covered for the first part of baking to soften the onions without drying them out.
- Golden Finish: Remove the cover towards the end to allow the top layer of cheese to achieve a beautiful golden crust.

Tennessee Onions Casserole Recipe:
- Preparation time: 15 minutes
- Cooking time: 70 minutes
- Servings: 6
- Equipment: Oven, 13x9 inch baking dish, aluminum foil
With this dish, you’ll bring a piece of Southern culinary tradition into your home, sure to be a hit at any dining table.
Ingredients:
- Cooking spray
- 2 ½ lbs sweet onions, sliced into ¼-inch thick rings
- 1 teaspoon dried thyme
- 1 teaspoon dried parsley flakes
- 1 teaspoon garlic salt
- ½ teaspoon dried oregano
- ½ teaspoon dry mustard
- ¼ teaspoon cayenne pepper
- ¼ cup salted butter, cut into thin slices
- 4 oz mild Cheddar cheese, shredded
- 4 oz smoked Gouda cheese, shredded
Directions:
- Preheat and Prepare: Warm your oven to 350°F. Coat a 13x9 inch baking dish with cooking spray.
- Season the Onions: In a large bowl, combine the onion rings with thyme, parsley, garlic salt, oregano, mustard, and cayenne pepper. Toss gently to coat evenly.
- Arrange in Dish: Transfer the seasoned onions to the prepared baking dish, spreading them out evenly.
- Add Cheese and Butter: Distribute slices of butter over the onions and sprinkle evenly with both cheeses.
- Bake Covered: Cover the dish with aluminum foil and bake until the onions are tender and the sides are bubbly, about 40 minutes.
- Finish Uncovered: Remove the foil and continue baking until the top is golden brown, about 30 additional minutes.
Ready to Serve!
This Tennessee Onions casserole is more than just a side dish; it’s a warm welcome to anyone who tastes it. Enjoy the melting cheeses, the tender onions, and the subtle kick of spices that make this dish uniquely comforting and utterly delicious.
Print📖 Recipe
Tennessee Onions
With this dish, you’ll bring a piece of Southern culinary tradition into your home, sure to be a hit at any dining table.
- Total Time: 1 hour 25 minutes
- Yield: 6 1x
Ingredients
- Cooking spray
- 2 ½ lbs sweet onions, sliced into ¼-inch thick rings
- 1 tsp dried thyme
- 1 tsp dried parsley flakes
- 1 tsp garlic salt
- ½ tsp dried oregano
- ½ tsp dry mustard
- ¼ tsp cayenne pepper
- ¼ cup salted butter, cut into thin slices
- 4 oz mild Cheddar cheese, shredded
- 4 oz smoked Gouda cheese, shredded
Instructions
- Preheat and Prepare: Warm your oven to 350°F. Coat a 13x9 inch baking dish with cooking spray.
- Season the Onions: In a large bowl, combine the onion rings with thyme, parsley, garlic salt, oregano, mustard, and cayenne pepper. Toss gently to coat evenly.
- Arrange in Dish: Transfer the seasoned onions to the prepared baking dish, spreading them out evenly.
- Add Cheese and Butter: Distribute slices of butter over the onions and sprinkle evenly with both cheeses.
- Bake Covered: Cover the dish with aluminum foil and bake until the onions are tender and the sides are bubbly, about 40 minutes.
- Finish Uncovered: Remove the foil and continue baking until the top is golden brown, about 30 additional minutes.
- Prep Time: 15 minutes
- Cook Time: 70 minutes







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