Spread 1 tablespoon butter on one side of each piece of bread.
On first slice of bread, place 1 slice cheese, ham and mango on unbuttered side of bread.
Top with remaining slice of cheese and second piece of bread, buttered side up.
Heat small, nonstick skillet over medium-low heat.
Place sandwich in skillet and cook until golden brown and cheese is melted, 3 to 4 minutes per side.