Various types of foods, such as cheese, bacon, peanut butter and more, are usually added between the slices creating a sandwich.
[3][4] The doughnut breakfast sandwich is usually made with bacon, eggs, sausage and some type of cheese like cheddar or American cheese.
[6] The Luther Burger is a bacon cheeseburger served on a doughnut bun.
A ham variation can be made with ham, Swiss cheese and a condiment like fruit preserved or spicy mustard.
Dessert versions are made with ice cream.