# Tennessee Onion Casserole

This is a delicious Tennessee Onion Casserole, a keeper recipe that features silky onions and a blend of cheeses.

- Total time: 75 min
- Cuisine: American
- Category: Dinner
- 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 Gruyère cheese
- 0.5 cup Pecorino Romano cheese
- 3 tablespoons butter

## Instructions

1. Peel and slice 3 pounds of sweet onions thin, about a quarter of an inch thick, using a mandoline.
2. Toss all the sliced onions together 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, 0.5 teaspoon of cayenne, and 1 teaspoon of stripped fresh thyme leaves.
4. Mix the spice blend together.
5. Drizzle about 2 tablespoons of good quality olive oil over the sliced onions and toss to coat.
6. Sprinkle about half of the spice and herb mixture over the onions and toss with hands to distribute evenly.
7. Add the remaining half of the spice mixture and toss again to fully coat the onions.
8. Grease a 13x9 baking dish.
9. Spread the first layer of seasoned onions evenly in the bottom of the baking dish.
10. Sprinkle 2 ounces of freshly grated Tillamook mild cheddar cheese over the first layer of onions.
11. Sprinkle 2 ounces of freshly grated Gruyère cheese over the cheddar cheese layer.
12. Add another layer of seasoned onions on top of the cheeses.
13. Sprinkle another 2 ounces of Tillamook mild cheddar cheese over the second layer of onions.
14. Sprinkle the remaining 2 ounces of Gruyère cheese over the cheddar.
15. Sprinkle about 0.5 cup of freshly grated Pecorino Romano cheese on top.
16. Dot the top of the casserole with a total of 3 tablespoons of butter cut into small pieces.
17. Tightly cover the baking dish with foil.
18. Bake in the 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
- bowl
- 13x9 baking dish
- foil

## Tips

- It's very important to slice the onions uniformly and thin, about a quarter of an inch thick, so they melt and are silky, not crunchy.
- You can use either light or dark brown sugar.
- You could use sharp cheddar instead of mild cheddar.
- You could use Parmigiano Reggiano or Grana Padano instead of Pecorino Romano cheese.

## Source

- Original video: https://www.tiktok.com/t/ZP8DKtjGE/
- Recipe page: https://www.cliprecipe.com/recipe/355f8cf6-5759-4740-9b35-5776f4347a14
- Extracted: 2025-11-18

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