Preheat oven to 400 F. On a lightly floured surface, divide the dough into 4 equal portions, and roll and stretch them into 8-inch rounds.

In a large bowl, combine ricotta, mozzarella, parmesan, spinach, and 1/4 teaspoon pepper. Spoon cheese mixture onto one side of each round of dough. Fold the dough over the filling and pinch the edges to seal. Brush the tops of calzones with oil.

Transfer to a parchment lined baking sheet & bake until golden, 12-15 minutes.