Go Back
–+ servings
Traditional Tennessee Onions Southern Recipe picture in a casserole dish from top down
Print Recipe
5 from 1 vote

Traditional Tennessee Onions Recipe

This sweet onions casserole recipe is a great side dish for all occasions — from cookout parties to holiday party menus or an easy week day dinner side dishes! It's also an easy make ahead for a make and take recipe for potlucks.
RECIPE TIP: Serve with some crusty bread (like sourdough) to sop up that yummy, ooey-gooey cheese onion sauce leftover after you've eaten the onions!
Prep Time10 minutes
Cook Time40 minutes
Course: Side Dishes
Cuisine: American
Servings: 8
Calories: 191kcal

Ingredients

  • 3-4 large Vidalia onions (or any sweet onions)
  • 1 teaspoon garlic powder (may use more based on personal tastes)
  • 1 teaspoon oregano (may use more based on personal tastes)
  • 4 Tablespoons butter
  • 1 cup sharp cheddar cheese shredded
  • 1 cup mozzarella cheese shredded
  • 1 cup fresh parmesan cheese shredded
  • Salt and pepper to taste*

Instructions

  • Preheat oven to 350°F. Grease a 9x13 baking pan. Set aside.
  • Slice onions into 1/4-inch rings. Separate the rings. (Don't leave them as nested slices or they won't cook evenly.)
  • Place a single layer of onion rings in the bottom of the greased baking dish. (You can overlap or place a few smaller slices into or on bigger slices, but don't layer them too thick or they won't cook evenly.)
  • WORKING IN LAYERS: Place one tablespoon of butter in small pats over the onions. Sprinkle with garlic powder and oregano. Evenly layer 1/3 cheddar, mozzarella, and parmesan cheeses over the onions.
    Repeat layers until all ingredients are used, ending with salt and pepper on the top layer of onions and then the last layer of cheese on top. (We usually get around 3 layers.)
  • Place tented aluminum foil on top of baking dish so it's not touching the cheese. Bake covered for 30 minutes. For the last 10 minutes, remove the aluminum foil and allow the cheese on top to brown slightly.
  • Serve warm.
    Store in an airtight container in the refrigerator for up to 5 days. (If it lasts that long! It never does in our house!)

Notes

*You may want to go light on the salt for cooking. The butter has salt and adds plenty of salt flavoring to the dish for cooking.

Nutrition

Serving: 1g | Calories: 191kcal | Carbohydrates: 10g | Protein: 8g | Fat: 14g | Saturated Fat: 8g | Polyunsaturated Fat: 0.5g | Monounsaturated Fat: 3g | Trans Fat: 0.2g | Cholesterol: 40mg | Sodium: 235mg | Potassium: 179mg | Fiber: 1g | Sugar: 6g | Vitamin A: 417IU | Vitamin C: 6mg | Calcium: 201mg | Iron: 1mg