Marshmallow Brownie Krinkle Sandwich Cookies. Brownie-like chocolate crinkle cookies sandwiched together with homemade marshmallow that's piped onto the cookies while still warm.  Unless you dislike chocolate (gasp!) or brownies (double gasp!), you'll agree with me that chocolate krinkle cookies are the bomb. I mean, they are essentially brownies in cookie form. What's not to love?