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 to form each mini sandwich.
03 - Spread a thin layer of softened butter on the outside of each assembled 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.