Brown your butter, let it cool, then beat it together with brown sugar
Mix in a room temperature egg, vanilla, and molasses until smooth
Whisk together flour, baking soda, ginger, cinnamon, allspice & salt, then mix with the wet ingredients
Fold in dark chocolate chunks and marshmallows until well combined
Roll the dough into balls, then roll in sugar, add to a baking sheet & bake
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