In a bowl mix all the dry ingredients and stir. To it add vanilla extract, vinegar, oil and coca cols and stir gently until mixed but do not overmix.
Spray doughnut pan with oil and fill upto ¾th full. Bake for 8-9 mins or until a toothpick inserted comes out clean and dry.
Transfer them to a cooling rack and make the glaze.
Bring Coca-Cola to a boil and boil until reduced to half. To it add butter and sugar. Stir until evenly mixed. Dip each doughnut into the glaze and let it dry. You can add sprinkles if are into that sort of thing!
Recipe by Naive Cook Cooks at https://www.naivecookcooks.com/coca-cola-glazed-chocolate-baked-doughnuts/