When melt the butter some will evaporate so fill it till one cup

Put the flour and baking soda and salt together in bowl

Put sugar and vanilla and butter in bowl and stir it and then put the egg and egg yolk

Then add the flour and stir and then add chocolate chips

Chill for an hour or over night

Put it in the oven for 350° F (180°C) for 12 to 14 minutes