Cost per Serving:
1. Place rack in top third of oven and preheat to 375°F. Mist a 9-inch pie plate with cooking spray.
2. Put 1/4 cup Parmesan and rest of ingredients (except pita wedges or chips) in a bowl; mix well. Spread in baking dish; sprinkle with reserved 2 Tbsp. Parmesan. Bake until bubbling, about 30 minutes. Turn broiler to high; broil until top is golden, 2 to 3 minutes, watching to be sure dip doesn't burn. Let cool 5 minutes. Serve hot with pita wedges or chips.