INGREDIENTS
1 cup
salted butter, softened
3 cups
granulated sugar
1/2 cup
vegetable oil (I like to use light olive oil)
5
large eggs
1 cup
buttermilk*
1 tbsp
vanilla extract
1/2 cup
full fat sour cream
3
and 1/4 cups all-purpose flour, spooned and leveled
3/4 tsp
kosher salt
1 tbsp
baking powder
2 cups
butter, softened
8 cups
powdered sugar
1 cup
heavy cream, divided
1 tsp
kosher salt
1 tbsp
vanilla