This creamy sauce is made without any butter or cream (it's skim milk and Parmesan), so it's low in fat. Cut fat even more by using lean, sliced deli ham instead of prosciutto. Peas add colorful green and filling protein to each slice.
Place an oven rack on lowest position and preheat to 500°F.
On a lightly floured surface, roll dough into a 14-inch round. Generously sprinkle a baking sheet with cornmeal. Place dough on sheet.
Bake until dough feels dry, about 8 minutes.
Heat oil in a pan on medium-high. Whisk in 1 1/2 Tbsp. flour and pepper. Cook until bubbling, about 2 minutes. Whisk in milk, bring to a boil, reduce heat and simmer, whisking, until thickened, about 2 minutes. Stir in Parmesan and peas.
Spoon mixture on crust, leaving a 1/2-inch border. Bake until crust is crisp and topping is bubbling, about 5 minutes. Top with prosciutto. Cut into 8 slices. Serve.