3 birthday cake with buttercream Recipes

unbleached all-purpose flour, plain (9 oz./250 g), baking powder, salt, whole milk, at room temperature (4 fl.ozs. /110 ml), vanilla extract (essence), unsalted butter, at room temperature (8 oz./225 g), sugar (10 1/2 oz./300 g), eggs, at room temperature (lightly beaten ), unsalted butter, at room temperature (12 oz./335 g), whole milk (4 fl.ozs. /110 ml), sugar (6 oz./160 g), egg yolks, bittersweet chocolate (110 g)

flour, sugar, baking soda, baking powder, unsweetened cocoa, canola oil, milk, eggs, boiling water , with, instant coffee, vegetable shortening, butter, softened, vanilla extract, sugar, milk