If you don’t have a grill, use a grill pan or large skillet (cast iron is great for this). Heat it over medium-high heat and add in enough olive oil so the peppers and onions are sticking. Sauté them until their soft and then remove them from the pan onto a plate. Add the sausage to the pan and cook until the outsides are golden and crisp and the sausage is heated through. Slice the sausage, peppers and onions in the same way that you would for the grilled method. Bake the pizza dough with the pesto, mozzarella and all of the toppings on it, except the basil, at 475° F. for 10-12 minutes. Garnish with the basil and serve.