Step 1: Prepare the Choux Pastry Base

1. Preheat oven to 400°F (200°C). Lightly grease a 9×13 baking dish or line it with parchment paper.
2. In a saucepan, heat water and butter over medium heat until the butter melts.
3. Bring to a boil, then remove from heat and stir in flour until the dough forms a ball.
4. Let cool for 5 minutes, then beat in the eggs one at a time, mixing well after each addition.
5. Spread dough evenly into the prepared baking dish and bake for 25-30 minutes, until golden brown. Let cool completely.

Step 2: Make the Cream Filling

1. Beat softened cream cheese in a mixing bowl until smooth.
2. In another bowl, whisk together cold milk and vanilla pudding mix until thickened.
3. Combine pudding with cream cheese, mixing until smooth.
4. Whip heavy cream, powdered sugar, and vanilla extract until stiff peaks form.
5. Fold whipped cream into the pudding mixture until fully combined.

Step 3: Assemble the Cake

1. Spread the cream filling evenly over the cooled choux pastry base.
2. Smooth out the surface with an offset spatula or the back of a spoon.
3. Refrigerate while preparing the chocolate topping.

Step 4: Make the Chocolate Topping

1. Heat heavy cream in a small saucepan or microwave-safe bowl until warm but not boiling.
2. Stir in chocolate chips, butter, and corn syrup, mixing until smooth.
3. Let cool slightly before pouring over the cream layer.
4. Spread chocolate evenly and refrigerate for at least 2 hours before serving.

Step 5: Serve and Enjoy!

1. Dust with powdered sugar before serving if desired.
2. Slice into squares and enjoy this rich and creamy dessert!