This Tennessee Onion Casserole is a crowd-pleasing dish that is perfect for any occasion. The combination of sweet onions, butter, and a blend of three types of cheese creates a savory and flavorful dish that will have everyone asking for seconds.
You can use any type of sweet onion, but Vidalia onions work particularly well.
You can use any type of cheese that melts well in this recipe, such as mozzarella or provolone.
To make this recipe vegetarian, you can use a plant-based butter substitute.