• Preheat oven to 350°
• Prepare a 13x9 baking pan with a baking spray or shortening and flour.
• In a bowl with a mixer cream butter, oil, and sugar.
• Add in eggs and mix until combined completely.
• In a medium bowl mix flour, cocoa, baking soda, and salt.
• In a liquid measuring cup mix milk with vinegar and stir.
• Alternate the flour mixture and the milk mixture, add each to the egg mixture beating until the mixture is all smooth.
• Stir in mini chocolate chips if you're adding them.
• Pour batter into prepared baking dish.
• Bake for 35-40 minutes or until a toothpick comes out clean.
• Cool in the pan completely or cool for 15 minutes then turn out to cooling rack if you don't want to serve it in the pan.

Chocolate cream cheese frosting

• In the bowl of a mixer cream butter with cream cheese, add in cocoa, powdered sugar, and heavy cream. Beat until smooth and creamy.
• Spread frosting over the completely cooled cake. Swirl with an offset spatula or the back of a spoon t creates a pretty pattern.