01 - Place a large skillet or grill pan over medium heat and allow it to warm through.
02 - Butter one side of each bread slice evenly, spreading to the edges for even browning.
03 - Place two bread slices butter-side down on a cutting board. Layer each with one slice sharp cheddar, one slice mozzarella, and one slice Gruyère.
04 - Drizzle 1 tablespoon honey over the layered cheese on each sandwich.
05 - Top with remaining bread slices, butter-side up, to form two complete sandwiches.
06 - Transfer to preheated skillet. Cook 3–4 minutes per side, pressing gently with spatula, until bread is golden brown and cheese is completely melted.
07 - Remove from pan, slice each sandwich in half diagonally, and drizzle with additional honey if desired. Serve while hot.