DIRECTIONS
Heat a large non-stick skillet over medium heat. Butter bread slices . Add 2 bread slices, buttered side down, to skillet. Top one with cheese slice. Top remaining bread slice with 3 slices meatloaf and 2 tablespoons grilled onions. Cook 3 to 4 minutes or until bread is nicely browned and cheese is melted.
Assemble sandwich with desired toppings. Repeat with remaining ingredients to make 4 sandwiches.