PREHEAT oven or grill to 475°F.
STRETCH dough to 12"-circle on lightly floured surface.
HEAT 2 tablespoons of oil in 12' cast-iron skillet over medium heat. Add sausage and cook until starting to brown, about 5 minutes. Remove sausage from skillet. Place ear of corn in skillet (or on grill grates) and cook 2 to 3 minutes per side, until kernels start to brown. Remove from heat, let cool slightly and cut kernels off of cob.
TRANSFER dough to hot skillet. Spread marinara or pizza sauce over dough and top with cheese, sausage, corn kernels, and sliced onion. Brush exposed crust with remaining olive oil. Place skillet in oven or on grill (closing lid if grilling), and cook 12 to 14 minutes, until crust is golden brown and cheese is bubbling.
REMOVE pizza from oven or grill and top with fresh basil leaves and crushed red pepper flakes.