Preheat the oven to 400ºF. Line a baking sheet with parchment paper.
Lightly flour your work surface. Roll out the pizza dough until it's 1/8-inch thick. Using a pizza cutter or sharp knife, cut the dough into 1/2-inch squares.
Melt the butter in a small saucepan set over medium-low heat then add the garlic and sauté, stirring, until it's golden. Remove the pan from the heat then carefully dip each dough square into the butter and arrange them on the baking sheet, spacing them about 1 inch apart.
Bake the croutons for 8 to 10 minutes, flipping them halfway through, until they're golden and crisped. Remove the croutons from the oven, immediately transfer them to a bowl, add the Parmesan cheese and parsley, and toss to combine.