- 1 large sweet onion (such as Vidalia®), finely chopped
- 1 1/2 cups mayonnaise
- 1 1/2 cups shredded Cheddar cheese
- 2 tablespoons white sugar
- Preheat oven to 325 degrees F (165 degrees C).
- Stir onion, mayonnaise, Cheddar cheese, and sugar together in a pie plate.
- Bake in preheated oven until bubbly and brown around the edges, 25 to 30 minutes.