Brown the ground beef in a skillet over medium-high heat until no pink remains. Drain any grease.
Add dressing, mustard, ketchup, and onion powder. Stir well and simmer 2-3 minutes or until heated through.
Pile onto buns with lettuce, pickles, and cheese.
Notes
Prepare toppings including shredded lettuce, American cheese slices, and pickles for servingKeep leftovers in an airtight container for 4 days and in the freezer for 3 months. Store the beef mixture separately from the buns and toppings.