Preheat oven 180C.
In a bowl, add the cake mix, butter and eggs and stir until combined.
Line two baking trays with baking paper.
Using a tablespoon, dollop a spoonful of mixture onto the baking trays, 3 to 4cm apart to allow for spreading.
Gently press with a fork and top each with four Smarties.
Bake for 10 minutes.
Remove from the oven and allow to cool and harden.