Place Pizza Dough on a large sheet of parchment paper. Cover with a damp towel; let rise in a warm place (85°), free from drafts, 45 minutes.
Preheat oven to 500°.
While dough rises, heat a large nonstick skillet over medium-high heat. Add oil; swirl to coat. Add onion; cook 5 minutes, stirring frequently. Sprinkle with sugar and salt. Continue cooking 15 to 20 minutes or until deep golden brown, stirring frequently.
Roll dough into a 12-inch circle on parchment paper. Crimp edges of dough with fingers to form a rim. Slide dough and parchment paper onto a large baking sheet. Place on bottom rack in oven. Bake at 500° for 5 minutes.
Spoon Pizza Sauce onto crust, spreading to rim. Top with prosciutto, cheese, and onion. Bake an additional 10 minutes or until crust is golden and cheese melts. Remove from oven; let stand 5 minutes. Cut into wedges.
Note: If using refrigerated Pizza Dough, let dough rise as directed in step 1 for 1 hour. Proceed as directed in recipe.
Kids Can Help: Older kids can help stir the onions while they caramelize, and then everyone can top their own pizzas with the sauce, prosciutto, onions, and cheese.