Serve up a patriotic pie for the Fourth of July: Tomatoes, cheese, and blue potatoes create the unmistakable flag design.
Position rack in lower third of oven and preheat to 500 degrees. Stretch pizza dough onto a 13-by-18-inch rimmed baking sheet brushed with extra-virgin olive oil, pushing the edges up the sides to create a border; season with salt and pepper.
Toss potato with 1 tablespoon extra-virgin olive oil and rosemary leaves; layer in upper-left corner. Sprinkle shredded mozzarella over remaining dough, inside border. Arrange cherry tomatoes into 7 stripes on dough.
Bake until cheese is bubbly and crust is set, 10 to 12 minutes. Immediately dot mozzarella pearls onto potatoes for stars.