HEAT oven to 350 degrees F. Spray a 12-cup fluted pan with flour no-stick cooking spray.
COMBINE cake mix, oil, water, eggs and pudding mix in a large bowl with an electric mixer at low speed until moistened. Beat 2 minutes at medium speed. Stir in chocolate chips. Pour batter into prepared pan.
BAKE 50 to 55 minutes or until toothpick inserted in center comes out clean. Cool in pan 20 minutes. Invert onto serving plate. Cool completely.
BEAT frosting, peanut butter, almond extract and milk in medium bowl with electric mixer until well combined. Spoon frosting over cooled cake. Garnish with chocolate shavings, if desired.