01 - Press a small heart-shaped cookie cutter through each bread slice to cut two hearts per slice, yielding 12 bread hearts. Repeat process with cheese slices to create 12 matching cheese hearts.
02 - Layer one cheese heart between two bread hearts, creating 12 complete mini sandwiches.
03 - Spread a thin, even layer of softened butter over the outside surface of each sandwich.
04 - Heat a nonstick skillet over medium heat. Place sandwiches buttered side down and cook for 2 to 3 minutes until golden brown. Flip and cook an additional 2 to 3 minutes until cheese melts completely and bread achieves crisp texture.
05 - Transfer to a serving plate and serve immediately while warm.