Position knife blade in food processor bowl; add first 8 ingredients. Process until smooth, stopping once to scrape down sides.
Pour batter into popover pans coated with cooking spray, filling one-half full. Place in a cold oven. Turn oven on 450°, and bake 15 minutes. Reduce heat to 350°, and bake 35 to 40 additional minutes or until popovers are crusty and brown.