Preheat the oven to 170°C. Lightly grease a baking tray.
Chop the butter and place into a bowl with the sugar. Starting at a low speed, beat together the butter and sugar with a hand mixer until mixture is soft and creamy.
Stir in the beaten egg, and then gradually add the flour, choc chips and nuts. Mix thoroughly until combined.
Place 1 tablespoon sized balls of mixture on the baking tray (allow some space for spreading!) and bake in the oven for 15-20 minutes or until nicely browned.
Allow to cool for 5 minutes on the trays. Transfer onto wire racks to cool completely before storing in an airtight container.