INGREDIENTS
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1 pound russet potatoes
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1 1/2 cups all-purpose flour, , plus more for rolling the dough
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2 teaspoons baking powder
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2 1/2 teaspoons kosher salt
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1 large egg, beaten
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2 tablespoons -extra--virgin olive oil , plus more for cookie sheet
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12 ounces fresh mozzarella, thinly sliced
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4 cherry or other small tomatoes, thinly sliced
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1 teaspoon dried oregano
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1/4 cup grated Grana Padano or Parmigiano Reggiano