In a mixing bowl, whisk together all the dry ingredients, getting out any lumps. In a separate bowl, beat the egg, buttermilk, vegetable oil (or butter) and vanilla. Pour the wet mixture over the dry and add the foot coloring; stir until combined. Fold in dark chocolate chips.

Heat a nonstick pan or griddle over medium heat. Once heated, add batter to the pan ⅓ cup at a time. Cook until bubbles form on the top, then flip; cook another minute or 2, just until the pancake is cooked through. Serve immediately with lots of butter and syrup.