Line two trays with baking paper. Combine the muesli and flour in a bowl. In another bowl, whisk the butter, honey and egg together. Add the butter mixture to the muesli bowl, mix well, then set aside for 15 minutes. Using a tablespoon, roll spoonfuls of the cookie mixture into balls, then place on your lined trays, 3cm apart. Flatten gently with a fork. Bake for 20 minutes in an oven preheated to 170?. Swap trays halfway through, to ensure even cooking between the top and bottom rack. Transfer to a wire rack to cool.