Preheat the oven to 325 degrees F (165 degrees C).
Combine rice cereal, sunflower seeds, raisins, cranberries, and rice flour in a medium mixing bowl. Add honey and stir to coat. Add egg and butter; stir until well distributed. Press mixture evenly into a 6-inch square baking pan.
Bake in the preheated oven until edges are browned, about 20 minutes. Let cool before cutting into bars.
