Marshmallow Fluff + Peanut Butter + Brownies = Yes, please. Marshmallow Brownies with Peanut Butter From 100 Cookies Notes This recipe also needs the recipe for My Favorite Brownies (instructions below). I actually prefer these brownies on the second day; the marshmallow fluff softens and the chocolate flavor intensifies. PRINT RECIPE 1/2 cup [107 g] creamy peanut butter 1/4 cup [30 g] confectioners’ sugar 2 tablespoons [29 g]…