01 - Set the oven to 400°F and line a baking sheet with parchment paper.
02 - Slice the baguette in half lengthwise, then cut each half into 3 to 4 pieces for serving.
03 - Combine softened butter, minced garlic, parsley, salt, and black pepper in a bowl until evenly mixed.
04 - Spread the garlic butter evenly over the cut sides of the bread pieces.
05 - Generously sprinkle shredded mozzarella followed by grated Parmesan on top of the buttered bread.
06 - Place the bread pieces cheese-side up on the prepared baking sheet.
07 - Bake for 12 to 15 minutes until the cheese is melted, bubbly, and the edges are golden brown.
08 - Cut additional slices if desired and serve warm.