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Preheat the oven to 400°F. Place 16 cupcake liners in a muffin pan or spray the pan well with nonstick baking spray.
Beat the butter and sugar together. Add the egg, vanilla, banana, and sour cream and beat again.
Stir together the flour, baking powder, baking soda, salt, cinnamon, and graham cracker crumbs.
Add the flour mixture alternately with the milk until it is all mixed in. Do not over-mix.
Stir in ¾ cup chocolate chips and ¾ cup marshmallow bits by hand.
Fill the liners with the batter. Sprinkle the batter with the remaining chips and marshmallow bits. Bake for 16 minutes.
Let cool in the pan for 3-4 minutes, then gently remove and place on a wire rack to cool completely. Store in a sealed container.