Preheat oven to 425°.
Pat dough into a 12-inch round pizza pan coated with cooking spray and sprinkled with cornmeal. Combine 1/2 cup cheese, nutmeg, pepper, and spinach in a bowl. Arrange mixture over dough. Top with bell peppers; sprinkle with thyme and 1/2 cup cheese. Bake at 425° for 15 minutes or until crust is browned and cheese melts.