In a bowl, dissolve the sugar in warm water and sprinkle the yeast on top. Let it sit for about 5-10 minutes until frothy.

In a large mixing bowl, combine the flour and salt, stirring well to combine.

Pour the yeast mixture into the flour mixture and stir until a dough begins to form.

Stir in the shredded mozzarella and grated Parmesan until evenly distributed; the dough will be slightly sticky.

Lightly flour a surface and knead the dough for about 5-6 minutes, until smooth and elastic.

Place the dough in a lightly oiled bowl, cover with a kitchen towel or plastic wrap, and let it rise in a warm place for about 30 minutes, or until doubled in size.

Preheat your oven to 400°F (200°C).

Punch down the risen dough and roll it out to your desired thickness on a floured surface.

Place it on a parchment-lined baking sheet, cut into strips, brush the melted butter on top, and bake for 15-20 minutes or until golden brown.