Best-Ever Calzones

Preheat oven to 500° and grease two large baking sheets with cooking spray. Divide pizza dough into 4 pieces. On a lightly floured surface, roll one piece of dough out into an 8" circle, about ¼" thick. Spoon pizza sauce in middle of dough, then dot with ricotta and top with pepperoni and mozzarella.  Gently fold dough in half, dampen seams with water and pinch together, then crimp edges all around. Repeat with remaining dough. Transfer to prepared baking sheets. Brush tops with oil and sprinkle with salt. Using kitchen scissors or a sharp knife, slit tops in 2 to 3 spots to create steam vents.  Bake until tops are golden and filling is bubbling, 20 minutes, brushing with more oil halfway through. Let cool 5 minutes before cutting open.