Tennessee Onion Casserole
Tennessee Onion Casserole
Ingredients
For the Casserole
- 3 pounds sweet onions, peeled and thinly sliced 1/4 inch thick with a mandoline, rings separated
- 2 tablespoons olive oil
- 4 ounces Tillamook mild cheddar cheese, freshly grated
- 4 ounces Gruyere cheese, freshly grated
- 1/2 cup Pecorino Romano cheese, freshly grated
- 2 tablespoons unsalted butter, cut into small pieces
For the Spice Blend
- 2 teaspoons salt
- 1 teaspoon black pepper
- 1 teaspoon smoked paprika
- 1 teaspoon granulated garlic
- 1 teaspoon dry mustard
- 2 teaspoons brown sugar, light or dark
- 1/2 teaspoon cayenne pepper
- 1 teaspoon fresh thyme leaves, stripped from stems
Instructions
- 1
Preheat your oven to 375°F. Lightly grease a 13x9 inch baking dish.
⏱️ 10 min•🌡️ 375
- 2
Peel the sweet onions and, using a mandoline, slice them very thinly, about 1/4 inch thick. Transfer the sliced onions to a large bowl and gently separate the rings by hand.
⏱️ 10 min - 3
In a small bowl, combine the salt, black pepper, smoked paprika, granulated garlic, dry mustard, brown sugar, and cayenne pepper. Mix thoroughly to create the spice blend.
⏱️ 2 min
- 4
Add the olive oil to the sliced onions in the large bowl and toss well to coat all the onion pieces.
⏱️ 1 min
- 5
Sprinkle half of the prepared spice blend over the oiled onions. Toss by hand to distribute the spices evenly. Add the remaining half of the spice blend and toss one final time, ensuring all onions are well coated.
⏱️ 2 min
- 6
Spread a generous first layer of the seasoned onions evenly across the bottom of the greased baking dish.
⏱️ 1 min
- 7
Evenly sprinkle 2 ounces of the freshly grated Tillamook mild cheddar cheese and 2 ounces of the freshly grated Gruyere cheese over the first onion layer.
⏱️ 1 min
- 8
Add the remaining seasoned onions on top of the cheese layer, spreading them out evenly.
⏱️ 1 min
- 9
Sprinkle the remaining 2 ounces of grated Tillamook mild cheddar cheese and 2 ounces of grated Gruyere cheese over the second onion layer.
⏱️ 1 min
- 10
Finally, sprinkle the 1/2 cup of freshly grated Pecorino Romano cheese over the very top of the casserole. Dot the top with the small pieces of unsalted butter.
⏱️ 1 min
- 11
Bake in the preheated oven for 40 to 45 minutes, or until the casserole is bubbly and the top is golden brown and caramelized.
⏱️ 40 min•🌡️ 375
- 12
Remove the casserole from the oven and let it rest for 5-10 minutes before serving. This allows the cheeses to set and the casserole to cool slightly.
⏱️ 10 min
Kitchen Tools
Nutrition Facts (per serving)
Tennessee Onion Casserole
Ingredients
For the Casserole
- 3 pounds sweet onions, peeled and thinly sliced 1/4 inch thick with a mandoline, rings separated
- 2 tablespoons olive oil
- 4 ounces Tillamook mild cheddar cheese, freshly grated
- 4 ounces Gruyere cheese, freshly grated
- 1/2 cup Pecorino Romano cheese, freshly grated
- 2 tablespoons unsalted butter, cut into small pieces
For the Spice Blend
- 2 teaspoons salt
- 1 teaspoon black pepper
- 1 teaspoon smoked paprika
- 1 teaspoon granulated garlic
- 1 teaspoon dry mustard
- 2 teaspoons brown sugar, light or dark
- 1/2 teaspoon cayenne pepper
- 1 teaspoon fresh thyme leaves, stripped from stems
Instructions
- 1
Preheat your oven to 375°F. Lightly grease a 13x9 inch baking dish.
⏱️ 10 min•🌡️ 375 - 2
Peel the sweet onions and, using a mandoline, slice them very thinly, about 1/4 inch thick. Transfer the sliced onions to a large bowl and gently separate the rings by hand.
⏱️ 10 min - 3
In a small bowl, combine the salt, black pepper, smoked paprika, granulated garlic, dry mustard, brown sugar, and cayenne pepper. Mix thoroughly to create the spice blend.
⏱️ 2 min - 4
Add the olive oil to the sliced onions in the large bowl and toss well to coat all the onion pieces.
⏱️ 1 min - 5
Sprinkle half of the prepared spice blend over the oiled onions. Toss by hand to distribute the spices evenly. Add the remaining half of the spice blend and toss one final time, ensuring all onions are well coated.
⏱️ 2 min - 6
Spread a generous first layer of the seasoned onions evenly across the bottom of the greased baking dish.
⏱️ 1 min - 7
Evenly sprinkle 2 ounces of the freshly grated Tillamook mild cheddar cheese and 2 ounces of the freshly grated Gruyere cheese over the first onion layer.
⏱️ 1 min - 8
Add the remaining seasoned onions on top of the cheese layer, spreading them out evenly.
⏱️ 1 min - 9
Sprinkle the remaining 2 ounces of grated Tillamook mild cheddar cheese and 2 ounces of grated Gruyere cheese over the second onion layer.
⏱️ 1 min - 10
Finally, sprinkle the 1/2 cup of freshly grated Pecorino Romano cheese over the very top of the casserole. Dot the top with the small pieces of unsalted butter.
⏱️ 1 min - 11
Bake in the preheated oven for 40 to 45 minutes, or until the casserole is bubbly and the top is golden brown and caramelized.
⏱️ 40 min•🌡️ 375 - 12
Remove the casserole from the oven and let it rest for 5-10 minutes before serving. This allows the cheeses to set and the casserole to cool slightly.
⏱️ 10 min