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Preheat the oven to 375 degrees or 350 degrees convection bake.
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Grease cookie sheet generously or use parchment paper.
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In a large bowl, cream together butter, brown sugar and white sugar.
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Beat in the egg, then stir in the vanilla. Do not over mix.
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Pour the flour, cocoa, baking soda, salt, chocolate chips and marshmallows into the bowl, stir into the creamed mixture just until the flour disappears. If using a mixer, mix on low for a few seconds, or you may use a large spoon. This is a folding action, do not over mix! If the batter is a bit dry, fold in a tablespoon or two of milk.
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Use a cookie or ice cream scoop and place the cookie dough balls onto the greased or lined sheet.
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Flatten the cookies slightly with palm of hand.
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Bake for 8 to 10 minutes or until the cookies are set on the outside.