Preheat oven to 450°. Place a 10-inch Dutch oven on bottom rack in oven to heat through, 2-3 minutes. , Roll dough on a lightly floured surface into a 12-inch circle. Fold an 18-in. piece of foil lengthwise into thirds, making a sling. Remove pan from oven; place dough on sling and gently lower dough into pan. Using a wooden spoon, move dough into place and up the sides, leaving sling in pan. Brush dough with oil; spread with marinara sauce. Top evenly with cheese, sausage, onion and mushrooms. , Bake until crust is lightly browned and crisp, about 20 minutes. Cool slightly. Using sling, remove from Dutch oven. Serve with basil, red pepper flakes and grated Parmesan cheese as desired.