Preheat the oven to 350°F and prepare the pan(s) with cooking spray.
In a mixer bowl, combine oil, butter, sugar, and eggs. Beat for 2 minutes.
Add melted milk chocolate, salt, flour, Cake Enhancer, baking soda, vanilla, dried whole milk, cocoa powder, and 1/2 cup buttermilk.
Beat for 1 minute, then scrape the bowl.
Add the remaining butter, and stir for 30 seconds.
Pour the batter into the pan(s) and bake according to size: 8" rounds (18-24 minutes), 9" rounds (20-28 minutes), cupcakes (15-18 minutes), and a 13" x 9" x 2" pan (25-35 minutes).
Allow the cake to cool in the pan for 10 minutes before transferring it to a cooling rack to cool completely.