Momofuku Birthday Cake

granulated sugar (1/2 cup)

light brown sugar (1 1/2 Tbsp (tightly packed))

cake flour (3/4 cup)

baking powder (1/2 tsp)

kosher salt (1/2 tsp)

rainbow sprinkles (2 Tbsp)

grapeseed oil (1/4 cup)

clear vanilla extract (1 Tbsp)

unsalted butter (room temperature (4 Tbsp, 1/2 stick))

vegetable shortening (1/3 cup)

granulated sugar (1 1/4 cups)

light brown sugar ((3 Tbsp tightly packed))

large eggs

buttermilk (1/2 cup)

grapeseed oil (1/3 cup)

clear vanilla extract (2 tsps)

cake flour (2 cups)

baking powder (1 1/2 tsp)

kosher salt (3/4 tsp)

rainbow sprinkles (1/4 cup)

rainbow sprinkles for sprinkling (2 Tbsp)

unsalted butter (at room temperature (1 1/2 sticks))

vegetable shortening (1/4 cup + 1/8 cup)

cream cheese (3 oz)

glucose (1.5 Tbsp)

corn syrup (1.5 Tbsp)

clear vanilla extract (1.5 Tbsp)

powdered sugar (sifted, 1 7/8 cups)

kosher salt (3/4 tsp)

baking powder (pinch)

citric acid (I used 1/4tsp lemon juice)

milk (1/4 cup)

clear vanilla extract (1 tsp)