Orange-Vanilla Wedding Cake

INGREDIENTS

For the cake:

1/2 cup

plus 1 TBSP unsalted butter (I used Plugra), at room temperature

1 1/4 cups

granulated sugar

1/4 cup

brown sugar

large eggs

heaping TBSP powdered buttermilk (optional but helps the cake)

1/3 cup

vegetable oil

1/2 cup

freshly squeezed orange juice

2 tsp

vanilla extract (I used Rodelle)

2 cups

cake flour

1 1/2 tsp

baking powder

1/2 tsp

salt

For the frosting:

1 1/2 cups

unsalted butter (I used Plugra), at room temperature

5 cups

powdered sugar

2 tsp

vanilla extract

Milk to thin