Cinnamon Churro Mug Cake

Ingredients

• 1 tablespoon roughly chopped dark chocolate
• 4 tablespoons all-purpose flour
• 2 tablespoons granulated sugar
• 3 tablespoons whole milk
• 1/2 teaspoon pure vanilla extract
• 1/8 teaspoon baking powder
• 1 tablespoon vegetable oil
• 1/16 teaspoon baking soda
• 1 tablespoon granulated sugar for topping
• 1/4 teaspoon ground cinnamon
• 1 teaspoon ground cinnamon for topping