Tennessee Onions Recipe: This Tennessee Onion Casserole Recipe Is Cheesy & Addictive | Casseroles | 30Seconds Food

Name: Tennessee Onions Recipe: This Tennessee Onion Casserole Recipe Is Cheesy & Addictive | Casseroles | 30Seconds Food
Cuisine: American
Ingredients: 2 - 3 whole sweet onions, sliced into 1/4- to 1/2-inch rings; 4 tablespoons butter, cut into small pieces; garlic salt or garlic powder, to taste; 1 cup shredded sharp cheddar cheese; 1 cup shredded mozzarella; 1/2 cup grated Parmesan; onions; onion-side-dishes; side-dishes; tennessee-onions; vidalia-onions