Plug in your waffle iron to preheat.
Whisk the egg in a small bowl. Stir in the cheese, ham, and garlic salt to combine.
Spoon half of the mixture into the hot waffle iron, close, and cook for 3-4 minutes or until your waffle iron stops steaming and the waffle is cooked through.
Remove the waffle to a plate and repeat with the remaining batter.
Stir together the mayo and mustard to use as a dip.
Slice the waffles in halves or quarters and serve with the dip.
