01 - Set oven to 400°F and line a baking sheet with parchment paper.
02 - Slice the baguette lengthwise, then cut into 6 equal pieces.
03 - Combine softened butter, minced garlic, parsley, salt, and pepper in a bowl until smooth.
04 - Spread the prepared garlic butter evenly over each bread slice.
05 - Generously sprinkle shredded mozzarella over the buttered bread, adding Parmesan if desired.
06 - Place bread slices on the lined baking sheet in a single layer.
07 - Bake for 10 to 12 minutes or until cheese is bubbly and golden brown.
08 - Broil for 1 to 2 minutes to achieve a crispier top, monitoring closely.
09 - Remove from oven, allow to cool briefly, and serve warm.