Heat Gas Or Charcoal Grill. Cut 18X12-Inch Sheet Of Heavy-Duty Foil; Place On Large Cookie Sheet. Spray Foil With Cooking Spray. Unroll Dough Onto Sprayed Foil. Starting At Center, Press Out Dough Into 14X10-Inch Rectangle. Spray Dough With Cooking Spray. Invert Dough Rectangle Directly Onto Grill Rack; Peel Off Foil And Return Foil To Cookie Sheet, Sprayed Side Up. Cook Uncovered On Gas Grill Over Medium-Low Heat Or On Charcoal Grill 4 To 6 Inches From Medium-Low Coals 2 To 4 Minutes Or Until Bottom Is Golden Brown. (Watch Carefully To Prevent Burning.) With Wide Metal Pancake Turner, Turn Crust Over. Cook 1 To 2 Minutes Longer Or Until Bottom Is Set But Not Brown. Carefully Remove From Grill; Place Browned Side Up On Foil. Close Grill. Top Crust Evenly With Pizza Sauce, Spinach And Mushrooms. Sprinkle With Cheese. Slide Pizza From Foil Onto Grill. Cover Grill; Cook 3 To 6 Minutes Longer Or Until Crust Is Golden Brown And Cheese Is Melted.