My girl has written an excellent recipe for Chocolate Snaps. Lucky lucky lucky us! In her own words:

Put the egg, butter and sugar in a bowl. Mix. when mixed add the flour, baking soda, salt and cocoa powder to the bowl. Mix. Bake at 375 for 12 mins. Note: with most cookies you can tell when they are done by the color around the edges of said cookies, but with chocolate ones it hard to tell if they are done or not so I would use a timer. I have burned many cookies that way.

1 egg. one stick of butter. 1 cup of sugar. 1 and a half cups flour. 1/2 tsp. salt. 1/2 tsp. baking power. 1/3 cup cocoa power.