1.Preheat the oven to 180°C/160°C fan-forced. Grease and line two oven trays with baking paper.
2.Beat butter, extract, sugar and egg in small bowl with an electric mixer until combined. Stir in the sifted flour, in two hatches. Knead the dough on a floured surface until smooth.
3.Roll the dough between sheets of baking paper until 5mm thick; refrigerate for about 10 minutes or until firm.
4.Using an 11cm bat cutter, cut out shapes from dough. Place bats on trays, Bake for 15 minutes; cool on trays.
5.To make glace icing, sift the icing sugar into a small heatproof bowl; stir in the water and colouring. Stir over a small saucepan of simmering water until icing is pourable.
6.Place bats on a wire rack, in a single layer; pour Glace Icing evenly over bats. Position choc chips on each bat for eyes. Stand until set. If icing becomes too thick to pour, reheat over simmering water, or stir in a tiny amount of extra water.
Un-iced biscuits suitable to freeze. Glace icing suitable to microwave. You can freeze un-iced biscuits between layers of freezer wrap for up to three months. Biscuits can be completed a day ahead; store, in a singe layer, in airtight containers.Note