# Tennessee Onion Casserole

A delicious and cheesy onion casserole, perfect for a keeper recipe.

- Total time: 75 min
- Cuisine: American
- Category: Side
- Language: en

## Ingredients

- 3 pounds sweet onions
- 2 teaspoons salt
- 1 teaspoon black pepper
- 1 teaspoon smoked paprika
- 1 teaspoon granulated garlic
- 1 teaspoon dry mustard
- 2 teaspoons brown sugar
- 0.5 teaspoon cayenne
- 1 teaspoon fresh thyme leaves
- 2 tablespoons olive oil
- 4 ounces Tillamook mild cheddar cheese
- 4 ounces Gruyere cheese
- 0.5 cup Pecorino Romano cheese
- 3 tablespoons butter

## Instructions

1. Peel and slice 3 pounds of sweet onions about a quarter of an inch thick on a mandoline.
2. Toss the sliced onions in a large bowl to break up all the rings.
3. In a small bowl, combine 2 teaspoons of salt, 1 teaspoon of black pepper, 1 teaspoon of smoked paprika, 1 teaspoon of granulated garlic, 1 teaspoon of dry mustard, 2 teaspoons of brown sugar, 1/2 teaspoon of cayenne, and 1 teaspoon of fresh thyme leaves.
4. Mix the spices and herbs together.
5. Add 2 tablespoons of olive oil to the onions and toss to coat.
6. Sprinkle about half of the spice mixture over the onions and toss to combine.
7. Sprinkle the remaining half of the spice mixture over the onions and toss again.
8. Grease a 13x9 baking dish.
9. Spread a nice layer of seasoned onions on the bottom of the baking dish.
10. Add 2 ounces of freshly grated Tillamook mild cheddar cheese over the onion layer.
11. Add 2 ounces of freshly grated Gruyere cheese over the cheddar.
12. Add another layer of seasoned onions on top of the cheese.
13. Add another 2 ounces of Tillamook mild cheddar cheese.
14. Add the remaining 2 ounces of Gruyere cheese.
15. Sprinkle about 1/2 cup of freshly grated Pecorino Romano cheese on top.
16. Dot the top with 3 tablespoons of butter cut into small pieces.
17. Tightly cover the baking dish with foil.
18. Bake in a preheated oven at 350°F (175°C) for 45 minutes.
19. Remove the foil and bake for another 30 minutes until golden brown and bubbly.

## Equipment

- mandoline
- large bowl
- small bowl
- fork
- 13x9 baking dish
- aluminum foil
- oven

## Tips

- Slice onions thinly and uniformly for a silky texture.
- You can use light or dark brown sugar.
- You can use sharp cheddar, Parmesan Reggiano, or Grana Padano cheese as substitutes.

## Source

- Original video: https://www.instagram.com/reel/DRKacp8jXaZ/?igsh=MXJjeDd0aHo4ejQ5Yg==
- Recipe page: https://www.cliprecipe.com/recipe/6fad329e-5e6c-427a-aa03-96dc61264ff8
- Extracted: 2025-11-19

Extracted from the video by Clip Recipe (https://www.cliprecipe.com). Quantities and steps are as stated or shown in the video. Site guide for agents: https://www.cliprecipe.com/llms.txt