Preheat the oven to 475 degrees F. Lightly flour a rimless baking sheet or pizza peel.
On a clean, floured surface, shape the dough into 2 medium-ish rounds. Let the dough sit for 5 minutes, then re-form it to make sure it’s as big as you’d like it to be. Place the dough on the prepared baking sheet or pizza peel.
Distribute the mozzarella on top of the crusts. Spread the pizza sauce over the cheese and scatter with the pepperoni, red pepper flakes, and slice jalapeños.
Transfer the pizzas to the oven and bake for 10 to 12 minutes, until the cheese has melted and the crust is golden brown. Remove from the oven and season with salt, pepper, and extra red pepper flakes if you like. Serve immediately.