Mix together cream cheese, powdered sugar and 1 cup whipped topping and spread over first layer while still warm. Stir lemon pudding mix, sugar, 1/4 cup water and egg yolks together in a medium saucepan. Stir in 2 cups water. Stirring constantly, with wire whisk, cook on medium heat until mixture comes to a full boil. (NOTE- if you are using instant pudding or a different flavor, use the ingredients & directions for preparation on the package!).
Cool 5 minutes, stirring twice. Cool about 30 minutes more and spread over two previous layers. Cool completely and top with remaining whipped topping. Chill.
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