Mix ground beef, egg, and onion soup in a medium mixing bowl. Form into 6 patties. Grill the patties over medium heat for 7-9 minutes on each side, or until they are done. While the burgers are cooking slice the onions.
After cooking burgers, heat a large skillet or griddle over med-high heat. Put a small amount of butter into the bottom of the pan. Sauté onions until they are transparent and tender. Remove onions and put a little more butter in the pan.
Place the bottom piece of bread for as many of the sandwiches you can fit easily into your skillet, topped with a burger, some of the sautéed onions and one slice of cheese. Cover with the other piece of bread. Cook until bread is toasted then flip and do the same for the other side.
Calories From Fat
% Daily Value*
Total Fat 0g
Saturated Fat 0g
Trans Fat 0g
Dietary Fibers 0g
* Percent Daily Values are based on a 2,000 calorie diet.
* Nutrition information is estimated based on the ingredients and cooking instructions as described in each recipe and is intended to be used for informational purposes only. Please note that nutrition details may vary based on methods of preparation, origin and freshness of ingredients used.