Easy & Flavorful Tennessee Onions: A Perfect Vegetable Side Dish (2024)

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Tennessee onions are a simple yet delicious side dish that combines sweet Vidalia onions with herbs and melted cheese! Enjoy them on the side or use them as a topping for burgers or hot dogs! This will quickly become your new favorite way to prepare onions!

Easy & Flavorful Tennessee Onions: A Perfect Vegetable Side Dish (1)
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  • Best Tennessee Onions Casserole
  • 🥘 Ingredients
  • 🔪 How To Make Tennessee Onions
  • 🌭 What To Serve With Tennessee Onions
  • 🥄 Make Ahead Options
  • ❓ FAQ
  • 📖 Recipe Card
  • 💬 Reviews

Best Tennessee Onions Casserole

Sauteed, caramelized, roasted, grilled- I love onions in every way, shape, and form! They are used in so many savory dishes because they easily add a ton of extra flavor!

This simple onion casserole gives you a whole new way to enjoy this delicious vegetable! Sliced sweet onions are perfectly seasoned and smothered in cheese and butter- what more could you possibly want?

🥘 Ingredients

The onions are easily the star of this recipe, so make sure you use your favorite sweet variety. You'll also want some fantastic cheese for melting!

Easy & Flavorful Tennessee Onions: A Perfect Vegetable Side Dish (2)
  • Sweet Onions - 2½ pounds of sweet onions, such as Vidalia or Walla Walla onions.
  • Seasonings - 1 teaspoon of garlic powder, ½ teaspoon of oregano (or use an oregano substitute), ¼ teaspoon of dry mustard powder (or check out these substitutes), ¼ teaspoon of salt, ¼ teaspoon of pepper, and an optional pinch of cayenne pepper if you would like some extra heat.
  • Butter - 4 tablespoons of salted butter cut into pats that are about ½ tablespoon each.
  • Cheddar - 1 cup of shredded sharp cheddar cheese.
  • Mozzarella - 1 cup of shredded mozzarella cheese. Alternatively, you could use Gouda or Monterey Jack.
  • Parmesan - ½ cup of shredded Parmesan cheese.

*Be sure to see the free printable recipe card below for ingredients, exact amounts & instructions with tips!*

🔪 How To Make Tennessee Onions

With how simple this casserole is to prepare, you're going to be blown away by how tasty it is! All you will need to get started is a knife and cutting board (or a mandoline), some measuring spoons, a cheese grater, and a 9x13 baking dish.

This recipe will make 8 servings of sweet and cheesy onions!

Easy & Flavorful Tennessee Onions: A Perfect Vegetable Side Dish (3)
Easy & Flavorful Tennessee Onions: A Perfect Vegetable Side Dish (4)
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Easy & Flavorful Tennessee Onions: A Perfect Vegetable Side Dish (6)

Step 1: Preheat. Preheat your oven to 350°F (175°C/Gas Mark 4) and butter a 9x13 baking dish.

Step 2: Prepare onions. Slice2½ pounds (1.13 kilograms) of yellow onionsto be approximately ¼-inch thick slices, then spread the onion rings in your prepared baking dish.

Step 3: Season. Season with1 teaspoon (3 grams) of garlic powder,½ teaspoon (1 gram) of oregano,¼ teaspoon (0.5 grams) of dry mustard powder,¼ teaspoon (1.5 grams) of both salt & pepper and the optional1 pinch of cayenne pepper.

Step 4: Add butter. Place the sliced pats of4 tablespoons (56 grams) of butterover the seasoned onion rings in the dish, spreading them so that they’re evenly placed.

Step 5: Layer. Layer the1 cup (113 grams) of cheddar cheese,1 cup (112 grams) of mozzarella cheese, and½ cup (50 grams) of Parmesan cheesein even layers over the onions. Push the cheese to the edges of the dish.

Step 6: Bake. Bake at 350°F (175°C/Gas Mark 4) for 40-45 minutes or until the cheese is melted and bubbly and the onions are tender. If desired, you can broil for a couple of minutes to brown the top of the onion casserole.

Step 7: Serve. Remove from the oven and serve immediately.

🌭 What To Serve With Tennessee Onions

These onions could easily be considered a side dish or even a condiment! They make a fantastic potluck side dish to be paired with crack chicken or pinwheel sandwiches.

As a condiment, load them up atop some grilled chicken quarters, grilled skirt steak, ribeye steak, burgers, or grilled brats! Enjoy!

💭 Tips & Notes

  • 2½pounds of onions is approximately 3 large onions or 4 medium-sized onions.
  • You can swap the butter for 1 cup of mayo over the sliced onions for a rich and tasty alternative. Chop the onions and serve this version as a hot dip for appetizers.
  • Separate the onion rings from each other (don't leave them nested) so that they cook evenly.
  • Serve with steak, burgers, meatloaf, or any hearty protein over hot dogs or sausages.
Easy & Flavorful Tennessee Onions: A Perfect Vegetable Side Dish (10)

🥄 Make Ahead Options

This casserole is already so easy to prepare, but here are a few other ways you can save yourself some time!

First, you can slice your onions and shred your cheese in advance. Store them both separately in a sealed container for a day or two until you are ready to assemble the casserole and bake.

Second, if needed, you can make the casserole completely the day before and keep it in the fridge. When ready, you can reheat it in the oven.

🥡 Storing & Reheating

Allow your casserole to cool to room temperature, and then store it in a sealed, airtight container in the refrigerator for up to 4 days.

Reheating

Reheat your Tennessee onions by covering the dish with foil and baking in the oven at350°F (175°C/Gas Mark 4) until heated through.Of course, if you are only reheating small amounts at a time, you could use the microwave.

>>>>See all of my recipes here<<<<

❓ FAQ

What Are The Best Types Of Onions For Tennessee Onions?

You'll definitely want to use sweet onions for this dish. The most common type used for Tennessee onions is Vidalia, but you can really use your favorite variety of sweet onions! Walla Walla or Texas Sweet are some other great options.

Can I Freeze Tennessee Onions?

I really don't recommend freezing this dish. The texture of both the onions and cheese will change upon thawing. Instead, make it fresh whenever you want to enjoy it.

Can I Make Tennessee Onions In Advance?

If needed, you could slice your onions and shred your cheese ahead of time. Simply store them in the fridge until you are ready to assemble the casserole and bake it.

Easy & Flavorful Tennessee Onions: A Perfect Vegetable Side Dish (11)

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Easy & Flavorful Tennessee Onions: A Perfect Vegetable Side Dish (12)

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5 from 31 reviews

Tennessee Onions

Tennessee onions are a simple yet delicious side dish that combines sweet Vidalia onions with herbs and melted cheese! Enjoy them on the side or use them as a topping for burgers or hot dogs! This will quickly become your new favorite way to prepare onions!

Author | Angela

Servings: 8 servings

Calories: 233kcal

Prep 5 minutes minutes

Cooking 45 minutes minutes

Total Time 50 minutes minutes

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Ingredients

  • lbs yellow onions (sweet onions such as Vidalia or Walla Walla onions)
  • 1 teaspoon garlic powder
  • ½ teaspoon oregano
  • ¼ teaspoon dry mustard powder
  • ¼ teaspoon each, salt & pepper (to taste)
  • 1 pinch cayenne pepper (optional)
  • 4 tablespoon butter (salted, cut into approximately ½ tablespoon pats)
  • 1 cup cheddar cheese (shredded, sharp cheddar is best)
  • 1 cup mozzarella cheese (shredded, or use gouda or monterey jack)
  • ½ cup Parmesan cheese (shredded)

Help Us Out!If you love a recipe, be sure to come back and share your ratings. This helps future users, and allows me to continue sharing free recipes! Angela

Instructions

  • Preheat your oven to 350°F (175°C/Gas Mark 4) and butter a 9x13 baking dish.

  • Slice 2½ lbs yellow onions to be approximately ¼-inch thick slices then spread the onion rings in your prepared baking dish.

  • Season with 1 teaspoon garlic powder, ½ teaspoon oregano, ¼ teaspoon dry mustard powder, ¼ teaspoon each, salt & pepper, and optional 1 pinch cayenne pepper.

  • Place the sliced pats of 4 tablespoon butter over the seasoned onion rings in the dish, spreading them so that they’re evenly placed.

  • Layer the 1 cup cheddar cheese, 1 cup mozzarella cheese, and ½ cup Parmesan cheese in even layers over the onions. Push the cheese to the edges of the dish.

  • Bake at 350°F (175°C/Gas Mark 4) for 40-45 minutes or until the cheese is melted and bubbly, and the onions are tender. If desired, you can broil for a couple of minutes to brown the top of the onion casserole.

  • Remove from the oven and serve immediately.

Notes

Notes:

  • 2½ pounds of onions is approximately 3 large onions or 4 medium-sized onions.
  • You can swap the butter for 1 cup of mayo over the sliced onions for a rich and tasty alternative. Chop the onions and serve this version as a hot dip for appetizers.
  • Separate the onion rings from each other (don't leave them nested) so that they cook evenly.
  • Serve with steak, burgers, meatloaf, or any hearty protein, over hot dogs or sausages.

Storing:

  • Allow your casserole to cool to room temperature and then store it in a sealed, airtight container in the refrigerator for up to 4 days.
  • Reheat your Tennessee onions by covering the dish with foil and baking in the oven at 350°F (175°C/Gas Mark 4) until heated through.

Nutrition

Calories: 233kcal (12%) | Carbohydrates: 14g (5%) | Protein: 10g (20%) | Fat: 15g (23%) | Saturated Fat: 9g (56%) | Polyunsaturated Fat: 1g | Monounsaturated Fat: 4g | Trans Fat: 0.2g | Cholesterol: 44mg (15%) | Sodium: 404mg (18%) | Potassium: 243mg (7%) | Fiber: 3g (13%) | Sugar: 6g (7%) | Vitamin A: 470IU (9%) | Vitamin C: 11mg (13%) | Calcium: 281mg (28%) | Iron: 1mg (6%)

Did you try this recipe? Rate it below!I can’t wait to see your results! Mention @bake_it_with_love or tag #bake_it_with_love!

Best Vegetable Side Dishes, how to make tennessee onions, tennessee onions, tennessee onions recipe, traditional tennessee onions recipe

Course Condiments, Side Dish, vegetable side dish

Cuisine American, Southern

Easy & Flavorful Tennessee Onions: A Perfect Vegetable Side Dish (13)

Angela @ BakeItWithLove.com

Angela is an at home chef that developed a passion for all things cooking and baking at a young age in her Grandma's kitchen. After many years in the food service industry, she now enjoys sharing all of her family favorite recipes and creating tasty dinner and amazing dessert recipes here at Bake It With Love!

bakeitwithlove.com/about/

Easy & Flavorful Tennessee Onions: A Perfect Vegetable Side Dish (2024)

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