tennessee onions casserole

3 Pinches 1 Photo
Appleton, WA
Updated on Mar 26, 2026

Frankensteined from different online recipes. Although not traditional, this is good topped with buttered, crushed Ritz-type crackers, too.

prep time 10 Min
cook time 1 Hr 15 Min
method Bake
yield 8 serving(s)

Ingredients

  • 4 large sweet onions, thinly sliced about 1/8-inch thick, separated into rings (2-1/2 to 3 pounds)
  • 2 tablespoons olive oil
  • 2 teaspoons Kosher salt
  • 1 teaspoon black pepper
  • 1 teaspoon fresh thyme
  • 1 teaspoon garlic salt
  • 1 teaspoon dry mustard
  • 1 teaspoon smoked paprika
  • 2 teaspoons brown sugar
  • 1/2 teaspoon cayenne, optional
  • 8 ounces shredded cheddar cheese
  • 8 ounces shredded Gruyere or other Swiss-type cheese
  • 3-4 tablespoons butter, cut into several small pieces

How To Make tennessee onions casserole

  • Step 1
    Preheat the oven to 350 degrees F.
  • Step 2
    Place thinly sliced onions in a large bowl and separate rings. Coat with olive oil.
  • Step 3
    Mix seasonings in a small bowl. Sprinkle half on the onions and mix, then sprinkle on the remaining seasoning and mix thoroughly.
  • Step 4
    In a greased 9x13-inch baking dish, layer half the seasoned onions and top with half the two cheeses. Layer the remaining onions and cheeses on top and dot with pieces of butter.
  • Step 5
    Cover with aluminum foil, and bake in a preheated oven until onions are soft and sides are bubbly, about 40 minutes.
  • Step 6
    Remove foil. Bake at 350 degrees F until top is golden, about 30 minutes. Can add crushed, buttered Ritz cracker crumbs on top and brown slightly.

Discover More

Ingredient: Vegetable
Method: Bake
Culture: American

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