Crunchy Chocolate chip cookies

Myself and my friend Kyung Hye Made Some very nice Chocolate chip cookies.

I made some cookies before check out here

Thank you Kyung Hye for being a great cooking partner.

2 cups of all purpose flour.

1/2 teaspoon of baking soda

1/2 teaspoon of salt

3/4 a cup of butter

1 cup of brown sugar

1/2 a cup of white sugar

1 egg

1 egg yolk

2 cups of chocolate chips or 1 cup of chocolate chips 1 cup of nuts.

Bake in a pre heated oven at 170-180 For 15-20 mins

I am still working on trying to make crunchy on the out side soft on the in side . Any ideas?