Yes, add the butter and marshmallows to a large microwave safe bowl and heat in the microwave in 30 second intervals until melted. Then stir in the chocolate sunflower butter. If needed, you can heat the bowl back up in 20 second intervals until the sunflower butter is melted. Add the brown rice cereal to a separate large mixing bowl. Pour the melted marshmallow mixture over top and mix well to distribute. Press the rice krispie mixture into a square baking pan, sprinkle some mini chocolate chips over top, and allow it to set before slicing into squares.