Line each of three 10-inch pizza pans with 12-ounces pizza dough. Bake at 425 F, 10 to 12 minutes or until lightly browned. Saute onions in oil until tender. Add potatoes and seasonings; mix well. Distribute 1/3 of potato mixture over each crust. Crumble 2-ounces of blue cheese over all. Bake at 425 F, 6 to 8 minutes or until cheese melts and pizza is lightly browned. Cut each pizza into 8 pieces.