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Tennessee Onions

Sweet Vidalia onions roasted until tender, blanketed in a thick layer of melted sharp cheddar and Parmesan cheese that bubbles and browns until it forms a golden, crispy crust on top. This Southern comfort food side dish transforms humble onions into something restaurant-worthy with minimal effort.
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Prep Time 10 minutes
Cook Time 45 minutes
Total Time 55 minutes
Servings: 6 servings
Course: Side Dish
Cuisine: Southern American
Calories: 285
Ingredients Equipment Method Notes

Ingredients
  

Main
  • 4 large Vidalia onions or other sweet onions, cut into 1/2-inch thick slices
  • 4 tablespoons unsalted butter melted
  • 1 and 1/2 cups sharp cheddar cheese shredded
  • 1/2 cup Parmesan cheese grated
  • 1/2 teaspoon garlic powder
  • 1/2 teaspoon salt
  • 1/4 teaspoon black pepper
  • 1/4 teaspoon paprika optional, for color

Equipment

  • 9x13 inch baking dish
  • Sharp chef's knife
  • Cutting board
  • Medium mixing bowl
  • Aluminum foil
  • Box grater or food processor
  • Measuring cups and spoons

Method
 

  1. Preheat your oven to 350°F and lightly grease a 9x13 inch baking dish with butter or cooking spray.
  2. Peel the onions and cut them into 1/2-inch thick rounds, keeping the rings intact as much as possible.
  3. Layer the onion slices in the prepared baking dish, overlapping them slightly if needed to fit them all in. Separate some of the rings to create more surface area.
  4. Drizzle the melted butter evenly over all the onions, then sprinkle with salt, pepper, garlic powder, and paprika if using.
  5. In a bowl, combine the shredded cheddar and grated Parmesan, then spread this mixture evenly over the seasoned onions, covering them completely.
  6. Cover the baking dish tightly with aluminum foil and place it in the preheated oven for 30 minutes.
  7. Remove the foil and return the dish to the oven for an additional 15 minutes, or until the cheese is golden brown and bubbly.
  8. Let the Tennessee Onions rest for 5 minutes after removing from the oven before serving.

Notes

Use freshly shredded cheese rather than pre-shredded varieties for the best melting and browning. Choose onions that are similar in size so the slices cook evenly. For extra depth, add a splash of Worcestershire sauce or a pinch of cayenne pepper to the butter before drizzling. Watch the cheese closely during the final uncovered baking to prevent burning. Store leftovers in an airtight container in the refrigerator for up to 4 days.