Press pizza dough into 15x10 inch rimmed baking pan. When is oven is ready, cook pizza dough for 5 minutes. When done, let rest for 2 minutes or so.
Meanwhile, lay proscuitto on a foil-lined baking sheet and put on lower rack in 400 degree oven. Leave in oven for 5-7 minutes, until crispy. When done, remove from oven and chop or crumble.
Combine alfredo and pizza sauces and spread evenly over pizza crust to the edges. Chiffonade the basil and spread over sauce. Spread proscuitto over pizza, then diced pepper. Evenly distribute shredded cheeses over all.
Put back in oven and cook for 10-15 minutes until browned and bubbly. Let rest for a couple of minutes before slicing into 8 slices.