Tennessee Onions

This Tennessee Onions casserole is the ultimate cheesy Southern side dish. Sweet onions are layered with cheddar, smoked Gouda, and Parmesan, then baked until soft, bubbly, and golden brown. If you love caramelized onions and melty cheese, this easy baked onion recipe will become your new favorite comfort food.

📝 Ingredients

• Cooking spray
• 3 pounds sweet onions (such as Vidalia, about 4 large, sliced crosswise into 1/4-inch rounds)
• 1 1/2 tsp kosher salt
• 1 tsp dry mustard powder
• 1 tsp garlic powder
• 1 tsp smoked paprika
• 1/4 tsp cayenne pepper (optional)
• 4 ounces mild cheddar cheese (shredded about 1 cup, divided)
• 4 ounces smoked Gouda (or smoked cheddar cheese, shredded about 1 cup, divided)
• 1/3 cup Parmesan cheese (grated)
• 4 tbsp butter (unsalted, diced)
• 2 tbsp fresh parsley (chopped, optional, for garnish)

👨‍🍳 Instructions

1. 1Preheat the oven to 350°F and lightly coat a 9x13-inch baking dish with cooking spray.
2. 2Place the sliced onions in a large bowl, separate into rings, and toss with salt, mustard powder, garlic powder, smoked paprika, and cayenne until evenly coated.
3. 3Arrange half of the seasoned onions in an even layer in the baking dish.
4. 4Sprinkle with half of the cheddar and half of the smoked Gouda.
5. 5Top with the remaining onions, then sprinkle with the remaining cheddar, smoked Gouda, and all of the Parmesan.
6. 6Scatter the diced butter evenly over the top.
7. 7Cover tightly with foil and bake for 45 minutes, until the onions are tender and bubbling.
8. 8Remove the foil and bake for 30 more minutes, until the cheese is fully melted and browned in spots. Garnish with parsley if desired and serve hot.