Preheat oven to 350 degrees (F).
Beat the eggs, add the butter and mix well.
Add vanilla pudding mix, boxed cake mix, and water and stir well. Batter will be thick.
Grease and flour two 10"x15" jelly roll pans, or line with parchment paper and grease.
Pour half the batter into each prepared pan and spread.
Bake 15 - 20 minutes or until toothpick comes out clean.
Cool on wire rack.
Mix butter and cream cheese. Sift the confectioners' sugar and add.
Beat well.
Add whipped topping and vanilla and stir.
After the cakes are cooled, spread the filling on one layer.
Place the second layer on top.
Cut into bars.
If you don't eat these right away, you can wrap them in plastic and store them in the freezer. They're good cold!
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