2 cups flour
1/3 cup cocoa
1/3 cup brown sugar-packed
2 tsp baking powder
3/4 tsp baking soda
1/8 tsp salt
1/2 cup butter (that’s 1 stick)-and it has to be butter. No margarine.
1 beaten egg yolk
8 oz. sour cream
Mini chocolate chips (I have always used regular chocolate chips), amount desired
Mix together the flour, cocoa, brown sugar, baking powder, baking soda, and salt.
2-In another bowl cream the butter, egg yolk, and sour cream.
3-Add the two mixtures together and mix.
4-Add chocolate chips & fold those in.
5-Drop by 2 tablespoons on a lined cookie sheet.
6-Bake 375 for 10-12 minutes.
Source: A patron at the library that my sister worked at during school.