Directions
- 1Peel the sweet onions.
- 2Slice the peeled onions thinly, about a quarter of an inch thick, using a mandoline.
- 3Toss all the sliced onion rings together in a bowl to break them up.
- 4In a small bowl, combine salt, black pepper, smoked paprika, granulated garlic, dry mustard, brown sugar, cayenne, and fresh thyme leaves.
- 5Mix the spice blend together.
- 6Drizzle olive oil over the sliced onions.
- 7Toss the onions with olive oil to coat them evenly.
- 8Sprinkle about half of the spice mixture over the oiled onions.
- 9Toss the onions with your hands to distribute the spices evenly.
- 10Add the remaining half of the spice mixture to the onions.
- 11Toss the onions again to ensure all spices are distributed.
- 12Grease a 13x9 baking dish.
- 13Place the first layer of seasoned onions in the baking dish.
- 14Sprinkle 2 ounces of freshly grated Tillamook mild cheddar cheese over the first onion layer.
- 15Sprinkle 2 ounces of freshly grated Gruyere cheese over the cheddar cheese layer.
- 16Add another layer of seasoned onions on top of the cheese.
- 17Sprinkle another 2 ounces of Tillamook mild cheddar cheese over the second onion layer.
- 18Sprinkle another 2 ounces of Gruyere cheese over the cheddar cheese.
- 19Sprinkle about a half cup of freshly grated Pecorino Romano cheese on top.
- 20Dot the top of the casserole with 3 tablespoons of butter, cut into small pieces.
- 21Cover the baking dish tightly with foil.
- 22Bake in a preheated oven at 350°F (175°C) for 45 minutes.
- 23Remove the foil from the casserole.
- 24Return the casserole to the oven for another 30 minutes, uncovered.
- 25Serve and enjoy.
Ingredients
- 3 lbs 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
Equipment
mandolinebowl13x9 baking dishfoil
Tips
- Use a mandoline to slice the onions thinly and uniformly so they melt and become silky, not crunchy.
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