Keto Tennessee Onions Recipe
These keto Tennessee onions are a rich, cheesy, low-carb twist on a classic Southern-style side dish. Thinly sliced sweet onions are baked with butter, cream, and three cheeses until golden, bubbly, and incredibly comforting. With simple ingredients, big flavor, and keto-friendly macros, this dish is perfect alongside grilled meats, BBQ, or holiday dinners. If you miss cheesy potato bakes on keto, this recipe is a must-try.
Ingredients
- 3 medium sweet onions thinly sliced
- 3 tbsp unsalted butter
- ¼ cup heavy whipping cream
- 1 cup shredded sharp cheddar
- 1 cup shredded mozzarella
- ¼ cup grated Parmesan
- 1 tsp salt
- ½ tsp black pepper
- 1 tsp Italian seasoning
- ½ tsp garlic powder
- ¼ tsp smoked paprika optional
- Pinch red pepper flakes optional
- 1 tsp Worcestershire sauce optional
Instructions
- Preheat the oven to 350°F (175°C). Lightly grease a small to medium baking dish.
- Slice the onions: Peel and thinly slice 3 medium sweet onions into rings or half-moons (about ⅛–¼ inch thick).
- Season the onions: Add onions to a bowl. Toss with salt, pepper, Italian seasoning, garlic powder, smoked paprika, and red pepper flakes (if using).
- Arrange in dish: Spread the seasoned onions evenly in the prepared baking dish, keeping them in a loose layer (not tightly packed).
- Add butter & cream: Dot with pieces of butter or drizzle melted butter over the onions. Pour heavy cream and Worcestershire sauce (if using) evenly over the top.
- Top with cheese: Sprinkle cheddar, then mozzarella, then Parmesan over the onions, covering most of the surface.
- Bake: Place the dish in the oven and bake for 30–35 minutes, or until onions are very tender and the top is melted, bubbly, and lightly golden. Tent loosely with foil if the top browns too fast.
- Rest & serve: Remove from the oven and let rest for 5–10 minutes before serving. Scoop into bowls or serve alongside your favorite keto main dish.