Bring butter, water and sugar to boil in medium saucepan, stirring occasionally. Add flour; cook and stir 3 min. or until mixture forms ball. Spoon into large bowl.
Add eggs, 1 at a time, beating with mixer after each addition until all ingredients are well blended. Spread onto bottom of 13x9-inch baking dish sprayed with cooking spray.
Bake 32 to 37 min. or until golden brown. (Dough will puff up along sides of baking dish). Cool completely.
Meanwhile, mix cream cheese and milk in medium bowl until blended. Add pudding mixes; beat 2 min. Refrigerate until ready to use.
Spread pudding mixture over cream puff crust just before serving; top with COOL WHIP.
Melt chocolate as directed on package; drizzle over dessert.