Medium-low heat helps the egg set without burning the muffins. The jam sounds unusual, but it’s the sweet-and-savory finish that makes this sandwich pop—strawberry, raspberry, or apricot all work. Swap ham for bacon, turkey, or sausage, or skip the meat for a vegetarian version. Leftovers keep 1–2 days refrigerated; reheat in a skillet to bring back some crispness.