To prepare a vegan banana chocolate chip cookie recipe, first you need to prepare your ingredients. First, you will need: 1 banana, 1 tbsp vanilla extract, and 1 cup of unsweetened coconut oil. You will also need 1 tablespoon of baking powder, 1/2 teaspoon of salt, 2 tablespoons of cocoa powder and 1/4 teaspoon each of ground cinnamon and nutmeg. Mix all of the ingredients together until they are well combined. Then, pour the batter into the prepared baking pan and bake for 12-15 minutes or until the edges are golden brown. Allow the cookies to cool before removing them from the pan.