Prepare the toppings: Cut the jalapeño pepper in half, remove the seeds, and finely dice it. Thinly slice the red onion. Chop the pepper. If the cheese is not yet shredded, grate it.
Place the dough on the pizza peel:
When the oven is ready, dust a pizza peel with cornmeal or semolina flour. (If you don’t have a pizza peel, you can use a rimless baking sheet or the back of a rimmed baking sheet. But a pizza peel is well worth the investment!) Stretch the dough into a circle; see this video for instructions. Then gently place the dough onto the pizza peel.
Quickly assemble the pizza: Thinly spread the pizza sauce over the dough, then sprinkle liberally with Cajun seasoning. Sprinkle with as much smoked gouda and mozzarella cheese as you like. Top with red onion, jalapeno, corn, and green pepper (if using). Sprinkle with a bit of kosher salt.
Bake the pizza: Transfer the pizza to the pizza stone using the pizza peel, and bake until the cheese and crust are nicely browned, about 5 to 7 minutes (or 1 minute in a pizza oven).