Tennessee Onions are a delightful Southern comfort food dish that highlights the sweet and savory flavors of caramelized onions baked to perfection with a cheesy, creamy finish. Originating from the heart of Southern cooking, this recipe captures the essence of traditional Southern onion dishes and transforms simple ingredients into a heartwarming side dish perfect for any occasion, including holiday side dishes or family gatherings.

Ingredients

Gather these ingredients to create a delicious baked onion casserole:

• Sweet Onions: 4 large Vidalia onions, thinly sliced
• Butter: 1/2 cup (1 stick), unsalted
• Cream: 1 cup heavy cream
• Cheese: 2 cups shredded cheddar cheese, divided
• Breadcrumbs: 1 cup, preferably panko for extra crunch
• Seasonings: Salt and pepper to taste
• Fresh Herbs: 2 tablespoons chopped parsley (optional, for garnish)

Note: Vidalia onions are preferred for their natural sweetness, but you can substitute with other sweet onions if necessary. Check out our related guide for more tips.

Steps / Instructions

1. Preheat the Oven: Set your oven to 350°F (175°C) to prepare for baking.
2. Caramelize the Onions: In a large skillet over medium heat, melt the butter. Add the sliced onions and cook, stirring occasionally, until they are golden brown and caramelized, about 20-25 minutes. Season with salt and pepper.
3. Assemble the Casserole: In a greased baking dish, layer the caramelized onions evenly. Pour the heavy cream over the onions, ensuring they are well-coated. Sprinkle 1 1/2 cups of shredded cheddar cheese on top.
4. Add the Breadcrumb Topping: In a small bowl, combine the breadcrumbs with the remaining cheese. Sprinkle this mixture over the casserole, creating a crunchy, cheesy topping.
5. Bake: Place the casserole in the preheated oven and bake for 25-30 minutes, or until the top is golden brown and bubbly.
6. Garnish and Serve: Remove from the oven, let cool slightly, and garnish with chopped parsley before serving.

Tips & Tricks

For best results, ensure onions are thoroughly caramelized to enhance their natural sweetness. Make this dish ahead by assembling it, covering, and refrigerating up to 24 hours before baking. When reheating leftovers, add a splash of cream to maintain the creamy texture. Avoid overbaking to prevent the cheese from becoming too crispy.

Variations

For a vegan version, replace butter with margarine, cream with coconut milk, and cheese with vegan cheese. To create a gluten-free version, opt for gluten-free breadcrumbs. You can also experiment with different cheese blends like gruyère or pepper jack for unique flavors.

Serving Suggestions

This cheesy onion gratin pairs wonderfully with a hearty main dish. Serve alongside a Slow Cooker Bolognese Sauce or Simple One-Pan Sausage, Green Beans & Potatoes for a complete Southern-inspired meal. Complement with a crisp white wine or iced tea for a refreshing beverage option.

FAQ

Can I use other types of onions? Yes, while Vidalia onions are preferred for their sweetness, other sweet onions like Walla Walla or Maui will work as well.

How do I store leftovers? Store in an airtight container in the refrigerator for up to three days. Reheat in the oven to maintain the crispy topping.

What is the best way to slice onions? Use a sharp knife or mandoline for thin, even slices to ensure uniform cooking.

Conclusion

Whether you’re looking to add a new dish to your holiday table or want to explore the savory onion flavors of Southern comfort food, Tennessee Onions are sure to impress. This comforting dish combines the rich, caramelized goodness of sweet onions with a creamy, cheesy texture that will have everyone reaching for seconds. Try this recipe and let the flavors transport you to the heart of Southern cooking!

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Tennessee Onions

Recipe by Shahd

★ ★ ★ ★ ★ 5 from 1 vote

Course: Side Dish Cuisine: American Difficulty: Easy

🍽️

Servings

− 1 +

⏱️

Prep Time

15 min

🍳

Cook Time

30 min

🔥

Calories

—

Tennessee Onions are a delightful Southern comfort food dish that highlights the sweet and savory flavors of caramelized onions baked to perfection with a cheesy, creamy finish.

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Ingredients

US Metric

• 4 large Vidalia onions, thinly sliced
• 1/2 cup (1 stick) unsalted butter
• 1 cup heavy cream
• 2 cups shredded cheddar cheese, divided
• 1 cup breadcrumbs, preferably panko for extra crunch
• Salt and pepper to taste
• 2 tablespoons chopped parsley (optional, for garnish)

Directions

1.

Preheat the Oven: Set your oven to 350°F (175°C) to prepare for baking.

2.

Caramelize the Onions: In a large skillet over medium heat, melt the butter. Add the sliced onions and cook, stirring occasionally, until they are golden brown and caramelized, about 20-25 minutes. Season with salt and pepper.

3.

Assemble the Casserole: In a greased baking dish, layer the caramelized onions evenly. Pour the heavy cream over the onions, ensuring they are well-coated. Sprinkle 1 1/2 cups of shredded cheddar cheese on top.

4.

Add the Breadcrumb Topping: In a small bowl, combine the breadcrumbs with the remaining cheese. Sprinkle this mixture over the casserole, creating a crunchy, cheesy topping.

5.

Bake: Place the casserole in the preheated oven and bake for 25-30 minutes, or until the top is golden brown and bubbly.

6.

Garnish and Serve: Remove from the oven, let cool slightly, and garnish with chopped parsley before serving.