Spread the Fluff: Using a spoon or spatula, evenly spread 2 tablespoons of marshmallow fluff onto each rice cake.
Dip in Chocolate: Melt the chocolate chips in the microwave in 30-second intervals, stirring in between, until smooth. Dip the marshmallow-covered side of each rice cake into the melted chocolate.
Cool and Set: Place the dipped rice cakes on a parchment-lined baking sheet, chocolate side up. Allow them to cool at room temperature or in the refrigerator until the chocolate is set.
Enjoy: Serve immediately or store in an airtight container for up to 3 days.