Cheesy Tennessee Baked Onion Gratin
Experience the rich comfort of a true Southern classic with this oven-baked onion gratin. Sweet onions are enveloped in a luscious trio of cheeses, seasoned with aromatic spices, and roasted until bubbling and golden. A perfect companion to grilled entrees or barbecue spreads.
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Servings: 6
Ingredients
- 1 cup shredded mozzarella cheese
- ½ teaspoon garlic powder
- 1 cup grated sharp cheddar cheese
- 4 tablespoons melted unsalted butter
- 3 medium sweet onions Vidalia recommended, peeled and sliced into ¼-inch thick rounds
- Salt and freshly ground black pepper to your preference
- ½ teaspoon smoked paprika
- ½ teaspoon dried oregano optional
- ½ cup finely grated Parmesan
Instructions
- Set the oven temperature to 350°F (175°C) and prepare a 9×13-inch baking dish by greasing it lightly.
- Spread the onion slices across the base of the baking dish in an even layer, gently pulling apart the rings to help them cook thoroughly and absorb seasoning.
- Pour the melted butter evenly over the onions. Follow by sprinkling the garlic powder, paprika, oregano (if using), and a touch of salt and pepper over the entire surface.
- Disperse the cheddar, mozzarella, and Parmesan cheeses evenly across the top of the seasoned onions.
- Place the dish uncovered in the preheated oven and bake for 30 to 35 minutes, or until the cheese is melted, bubbling, and lightly browned.
- Allow the gratin to rest briefly before serving. Pairs excellently with grilled meats, barbecue favorites, or as a flavorful side for casual gatherings.