Buttermilk Birthday Cake with Malted Chocolate Frosting

INGREDIENTS

3 cups

cake flour

2 cups

superfine sugar

1 tbsp

plus 1 teaspoon baking powder

3/4 tsp

salt

3/4 cup

plus 2 tablespoons (200 g) cold unsalted butter, cut into pieces

2 tbsp

vegetable oil

1 1/4 cups

buttermilk, room temperature

2 tsp

vanilla bean paste or pure vanilla extract

large eggs, room temperature

2 1/4 cups

unsalted butter, room temperature

4 cups

confectioners' sugar

1/2 cup

Ovaltine or malted milk powder

1/3 cup

whipping cream

2 tsp

pure vanilla extract

salt

1/4 cup

sour cream or plain Greek yogurt

9 oz

premium dark chocolate, chopped or callets

White nonpareils for decorating, optional

Large pastry bag

Decorating tip Ateco #887