Preheat oven to 350°F/180°C and line a cupcake/muffin baking pan with 12 cupcake liners.
In a medium sized bowl, whisk together the eggs, sugar, oil, and vanilla extract.
Stir in milk, then add the rest of the ingredients (flour, cocoa powder, baking powder, salt), and mix until just combined but do not over mix. They batter won't be very thick, sort of runny and that's okay.
Pour the batter into liners, and bake for 18-20 minutes or until a toothpick comes out clean. When completely cooled down, decorate.
Decorate with the vanilla frosting and put a marshmallow on each cupcake.
Draw faces and arms using the black icing, and make buttons out of the sprinkles/funfetti. To make the nose use fondant.