Preheat oven to 350.
Cream together the butter, cream cheese, Biscoff spread, and sugars. Add the egg and vanilla and mix well. Sift dry ingredients together and slowly incorporate them with the wet ingredients. Add the chocolate and marshmallows and incorporate.
Use a tablespoon scoop or tablespoon to drop dough onto the cookie sheet. Bake for 10-12 minutes. Leave them on the cookie sheet for a few minutes before moving to a rack to cool.
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