On A Lightly Floured Surface, Roll Pizza Dough Into A 14-In. X 10-In. Rectangle. In A Large Bowl, Combine The Spinach, Cheese, Onion And Garlic; Spoon Over Dough To Within 1 In. Of Edges. Roll Up Jelly-Roll Style, Starting With A Long Side; Tucks Ends Under And Pinch Seam To Seal. Place Seam Side Down On A Baking Sheet Coated With Cooking Spray. Bake At 400