Novelty Red Velvet Skillet Cake

NOVELTY RED VELVET SKILLET COOKIE1 ½ c. flour¼ c. unsweetened cocoa powder½ t. baking soda¼ t. salt1 stick butter, softened½ c. sugar½ c. packed light brown sugar1 egg2 t. liquid red food color1 t. white vinegar1 c. semisweet chocolate chunks1…