HEAT oven to 350ºF.
SEPARATE biscuits; cut into quarters. Mix dry pudding mix, zest and cinnamon in medium bowl. Add biscuit pieces in small batches; toss to evenly coat. Drizzle with butter; toss lightly. Place in 9-inch round pan sprayed with cooking spray.
BAKE 20 min. Cool 5 min. Remove from pan to wire rack; cool 10 min.
MICROWAVE cream cheese spread in small microwaveable bowl on HIGH 15 sec.; stir in sugar and milk. Drizzle over cake; sprinkle with nuts.