Easy recipe for sweet onion dip that uses 3 whole ingredients and will wow your dinner guests as an amazing appetizer.
Chop onions into fine pieces. Do not shred them, however. Also, be sure not to use Spanish, yellow, white or any other strong tasting onion with this recipe. Even red onions, which have a mild flavor, are not the best choice. Walla walla or vidalia onions are best for this recipe.
Shred the Swiss cheese into a small bowl with the grater of your choice. Use another cheese if you desire, but the Swiss cheese seems to go best with the flavor of the sweet onions.
Mix chopped onion, shredded cheese, and mayo together in a glass baking dish. Bake at 350 °F/ 177 °C until bubbly and browned on top (about 30 minutes).
Refrigerate leftovers and reheat to re-serve as desired.
You've probably already figured this out, but if you would like to make a larger pan of this onion dip recipe, simply increase the ingredients in a 1:1:1 ratio.
In other words, to triple the recipe to make a large pan for a party, use 3 cups of chopped sweet onion, 3 cups grated Swiss, and 3 cups mayo.