Cream the butter and sugar together in a mixer until fluffy.
Mix in flour, then chocolate. Dough might be a little crumbly – don’t worry!
Form the dough into a ball, wrap with plastic wrap and chill for at least 30 minutes.
Roll out the dough until it is about 1/4 inch thick – I like to do this on a silicone mat so it doesn’t stick.
Preheat oven to 350.
Using a biscuit cutter or a jar lid, press dough into round shapes and place on cookie sheet. Bake for about 20 minutes or until golden. Cool on wire racks.