Southern Tennessee Onions Casserole Recipe - Easy (2026)

A delightful Vidalia onion casserole made with sweet onions, garlic, and melted cheese

Apr. 10, 2026 at 2:51am

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A boldly colored, silkscreen-style illustration featuring a repeating grid of a baked onion casserole dish, capturing the nostalgic comfort and modern flair of this Southern recipe.A vibrant, pop art-inspired celebration of the humble yet flavorful Vidalia onion, the star ingredient in this comforting Southern-style casserole.Rocky Top Today

This Southern Tennessee Onions Casserole Recipe is an easy and delicious way to enjoy sweet Vidalia onions. The dish features sliced onions layered in a baking dish, topped with butter, garlic, and melted cheddar and mozzarella cheeses. It's a savory, comforting side dish that's perfect for any occasion.

Why it matters

This recipe highlights the versatility and flavor of Vidalia onions, a beloved variety of sweet onions grown in Georgia. While the dish is called 'Tennessee Onions,' it showcases the culinary traditions and ingredients of the American South, making it a nostalgic and crowd-pleasing option.

The details

To make the casserole, sweet Vidalia onions are sliced into 1/2-inch rings and arranged in a baking dish. Pats of butter, garlic salt, and pepper are scattered over the onions, followed by shredded cheddar, mozzarella, and Parmesan cheeses. The dish is then baked at 350°F until the onions are tender and the cheese is melted and bubbly.

  • The recipe was originally published in 2026.

The players

Vidalia Onions

A variety of sweet onions grown in the Vidalia, Georgia region, known for their mild, sweet flavor.

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The takeaway

This Southern-inspired onion casserole is a delicious and easy-to-prepare side dish that showcases the natural sweetness and versatility of Vidalia onions. It's a comforting and crowd-pleasing recipe that can be enjoyed year-round.