This is an easy recipe for rice flour icebox cookies using melted butter. Melt unsalted butter in a double boiler, then mix with egg, powdered sugar, salt, and vanilla extract. Add rice flour and almond flour to make the dough, mixing half with fragrant black sesame seeds and the other half with sweet chocolate chips. Shape each into a log, sprinkle with granulated sugar, and freeze until firm. Then slice into 1.5cm thick slices. Bake in a preheated oven for 15-20 minutes to complete crispy and flavorful rice flour cookies. This gluten-free sweet is perfect for beginners and makes a great gift or for enjoying at home.