01 -
Heat oven to 425°F and line two 8-inch cake pans with parchment.
02 -
Boil water and butter, stir in flour, salt, and baking powder until forms dough.
03 -
Mix in eggs one at a time until well combined.
04 -
Divide batter between pans, bake 35 minutes until golden.
05 -
Heat milk and vanilla, temper with egg mixture, cook until thickened.
06 -
Cool pastry cream completely, then fold in whipped topping.
07 -
Layer cake and filling, chill 2 hours.