Steps to make the Yellow Cake:
Preheat your oven to 325 degrees.
Combine the flour, baking powder, and salt and sit to the side.
Then, using a hand or stand mixer, beat the butter together then slowly add in the sugar.
Then add the vegetable oil. Mix on medium speed until light and fluffy (approximately 5 minutes).
Add the vanilla to the batter.
Add the eggs to the bowl one at a time, mixing only until combined before adding the next egg.
Mix in the flour 1 c at a time, alternating with the buttermilk, beginning and ending with the flour.
Spray a 12-cup bundt pan with baking spray.
Pour the batter into the pan and spread it evenly. Bake the pound cake for about an hour and 15 minutes.
The cake is done once a toothpick inserted in the center of the cake comes out clean. Remove the cake from the oven and allow it to cool for 20 minutes before removing it from the pan.
Steps to make the frosting:
Using a hand or stand mixer, add the melted butter to the bowl.
Add the cocoa powder to the bowl, then mix on low speed until combined. Scrape down the sides of the bowl.
Mix in the vanilla extract, then add the powdered sugar to the bowl.
Add the milk to the bowl and mix until combined and the frosting becomes light and fluffy. (The speed may be increased as the frosting combines.
Frost the cooled cake as desired and serve!