Place an oven rack on lowest position and preheat to 500°F.
On a lightly floured surface, roll dough into a 14-inch round. Generously sprinkle a baking sheet with cornmeal. Place dough on sheet.
In a large bowl, stir together garlic and oil. Add potatoes, rosemary and salt. Top dough with potatoes, overlapping, leaving a 1/2-inch border. Sprinkle with Parmesan and pepper.
Bake until cheese has melted and crust is crisp, about 13 minutes. Cut into 8 slices. Serve.
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