Prepare a pizza pan with cooking spray. Roll out dough and place on pizza pan. Rise according to package directions; set aside. Meanwhile, cook chicken and onions in a large skillet until chicken is no longer pink. Add sloppy joe sauce mix, tomato paste, and water. Mix well and bring to a boil. Reduce heat and simmer a few minutes. Add corn. Preheat oven to 425. Spread chicken mixture onto risen crust. Sprinkle cheese evenly over top. Bake for 12 minutes, or until heated through and cheese has melted.