MIX batter ingredients in a pre-sprayed 9 1/2-inch deep dish pie plate. TOP batter with evenly spaced spoonfuls of hot fudge sauce. Using spoon, swirl fudge sauce into batter. BAKE by placing in a COLD oven; set temperature to 350°F. Bake 25 to 30 minutes, until lightly browned and firm in center. Cool 10 minutes. Combine icing ingredients and drizzle over warm cake. Recipe Note: If desired, batter may be mixed in a separate bowl. Proceed as directed above.