Cream the butter, oil, and sugar in the bowl of a stand mixer.
Add the eggs one at a time, beating well after each addition. Then,
add your vanilla and stir to combine.
Combine your dry ingredients in a separate bowl, then add about ⅓ of
the mixture into your bowl.
Use a spatula to gently stir until just combined. Follow this with
about ½ of your buttermilk, and stir again until just combined
Add ½ of the remaining dry ingredients stir, and then add the
remainder of the buttermilk.
Finish with the final portion of dry ingredients and use your spatula
to make sure the batter is smooth,do not over mix.
Divide the batter evenly into two greased baking pans.
Bake, then use a toothpick to test for doneness.
Let the cakes cool in their pans a bit before inverting onto a cooling
rack, where they’ll need to cool completely before frosting.