I am quite a fan of Australian cook Bill Granger's books. His chocolate chip cookies are a family favourite. If you make a double batch you can freeze the raw cookie dough so you have some more of these heavenly treats at the ready when unexpected visitors arrive. You can cook the raw cookie dough from frozen at the temperature and cooking times stated below. 

Bill Granger's Chocolate Chip Cookies

125g unsalted butter, softened
1 1/4 cups tightly packed brown sugar
1 tsp vanilla essence
1 egg, lightly beaten
1 1/2 cups plain (all purpose) flour
1/2 tsp baking powder
a pinch of salt
1 1/2 cups chocolate bits

Preheat the oven to 180 degrees C (350 degrees F).
Place butter and sugar in a bowl and beat until light and creamy.
Add vanilla and egg and stir to combine.
Stir in the sifted flour, baking powder and salt until just combined.
Fold through chocolate chips.
Place spoonfuls of cookie mixture on a greased and lined baking tray, allowing room for spreading.
Cook for approx. 15-20 minutes until they turn pale gold.
Allow to cook on the tray for 5 minutes before placing biscuits on a wire rack to cool.
Makes 16.

Bill Granger, Bills Sydney Food, Murdoch Books: Sydney, 2000, p. 111.