01 - Using a small heart-shaped cookie cutter, cut out two hearts from each bread slice to yield 12 hearts total. Repeat with cheese slices to create 12 matching cheese hearts.
02 - Place one cheese heart between two bread hearts, creating 12 mini sandwiches.
03 - Spread a thin layer of softened butter on the outside of each sandwich.
04 - Heat a nonstick skillet over medium heat. Place sandwiches buttered side down and cook for 2-3 minutes until golden brown. Flip and cook the other side for another 2-3 minutes until cheese is melted and bread is crisp.
05 - Serve warm.