Preheat oven to 375 °F.
Sift the flour, baking powder, and cocoa powder in a bowl. Set aside.
Bring water in a pot to a boil.
Whisk the sugar, eggs, butter, baking soda, and milk in a bowl.
Steam over a medium-high heat until the sugar and butter completely dissolve. Stir as needed (approx. 6-8 minutes).
Remove from the heat and quickly stir in the flour mixture while still hot.
Set aside for the dough to cool (approx. 15 minutes).
Dust the surface with flour. Put the dough onto the work surface and divide into 8 pieces.
Sprinkle flour over the dough. Roll the dough out to about 9".
Place a round dish over the dough and cut out an even circle. Keep the scraps.
Place the cake layer onto parchment paper and bake (approx. 6-8 minutes).
Repeat with all the 8 layers. Bake the leftover scraps.