Heat oven to 400°F. Grease cookie sheet and hands. Press dough into 12x10-inch rectangle on cookie sheet.
Bake 12 to 14 minutes or until edge is beginning to brown. Meanwhile, in 10-inch skillet, cook beef and sloppy joe sauce over medium heat, stirring occasionally, until hot. Spoon beef mixture over crust. Sprinkle with cheese.
Bake 8 to 10 minutes longer or until crust is deep golden brown and cheese is melted. Sprinkle with onions. Let stand 5 minutes before serving.