Beat the butter and the sugar in the bowl of an electric mixer until light and fluffy. add the eggs one at a time. beating well after each addition.
Add vanilla. Alternatively add flour mixture with milk, beating well after each addition. Lastly, fold in chocolate chips. Divide the batter into two muffin tins lined with 16 cupcake liners total. Bake at 350 for 22-25 minutes or until done. Cool in pans for 15 minutes. Remove from pans and cool completely on a wire rack.
Icing: I used a vanilla whipped kind, store bought. It has the EXACT same consistency as gooey marshmallows.