2 1/4 cups all purpose flour

2 teaspoons baking powder

2 teaspoons baking soda

1/2 teaspoon salt

2 cups water

2 cups sugar

6 tablespoons unsalted butter

2 tablespoons vegetable oil

1 tablespoon vanilla extract
1 vanilla bean, scraped

2 large eggs

Vanilla Buttercream:
1 cup (2 sticks) unsalted butter, room temperature
3 cups powdered sugar
1 tablespoon vanilla extract
up to 3 tablespoons milk