2. Whisk Together the Flour, Cocoa Powder, Baking Soda, and Salt in a Medium Bowl. in the Bowl of a Stand Mixer Fitted with the Paddle Attachment, Beat Together the Butter, Shortening and Brown Sugar on Low Speed until Just Combined. Increase the Speed to Medium and Beat until Fluffy and Smooth, about 3 Minutes. Add the Egg and Vanilla and Beat for Another 2 Minutes

Add Half of the Flour Mixture and Half of the Milk to the Batter and Beat on Low until Just Incorporated. Scrape down the Sides of the Bowl. Add the Remaining Flour Mixture and ½ Cup Milk and Beat until Completely Combined
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