Preheat oven to 400˚F.
Place 1 ½ tablespoons oil and sweet potato into a large mixing bowl and toss together. Season with salt and pepper.
Spread onto a baking sheet and roast for 6 to 8 minutes. Remove from the oven and allow slices to cool.
Raise the oven temperature to 450˚F.
On a clean surface roll dough into a 14” circle, about ⅛” thick. Sprinkle cornmeal onto a baking sheet and top with rolled dough.
Brush the remaining oil over the dough and spread potato slices and ½ the cheese over the surface, leaving a `½ inch border around the edge.
Top with ½ the salami, onions, and remaining cheese.
Bake pizza for 12 to 15 minutes or until crust has browned and cheese is bubbling.
Remove from the oven and allow the pizza to cool for about 5 minutes.
Top with remaining salami and arugula and serve (with crushed red pepper flakes, if desired).