Toast muffin on a griddle, cut side down, until golden brown.
Spread cheese on the toasted side of each muffin half.
Cook ham until heated through; set aside.
To cook egg whites, spray a skillet with nonstick cooking spray and place over medium heat.
Pour egg whites into prepared skillet and cover with a lid for 3-5 minutes or until eggs are set. Use a rubber spatula to gently loosen eggs from the pan and fold up.
Top bottom half of the muffin with cooked ham, egg whites, sauce and remaining muffin half.