1. Melt butter in a large pot. Slowly add the marshmallows and melt them while stirring constantly.
2. Remove pot with fully melted mass from stove and mix in the Rice Krispies thoroughly. Then place everything in an ovenproof dish covered with baking paper. Press flat and let cool.
3. Cut small rectangles, add sticks and thin dip halfway in the glaze. Then decorate with Smarties and let cool on baking paper.