Mix ground beef with French onion dip seasoning.
Form 4 thin burger patties.
Place American cheese in between 2 burger patties and make sure edges are sealed.
Place on grill for 4 minutes.
Flip and grill for another 3-4 minutes or until burgers reach desired temperature.
Place burger on potato bun. Top with tomatoes, lettuce, ketchup and mustard. Enjoy!