Chocolate Rocks (Grandmom Colangelo's)

1 stick butter
2 cups sugar
2 eggs
4 Tbs cocoa
1/3 cup sour milk (add 1 tsp vinegar and let sit for 2 minutes)
1 tsp vanilla
¼ tsp cinnamon
¼ tsp salt
3-1/2 cup flour
1 tsp baking soda
1 tsp baking powder

Mix.  Roll in balls.  Bake at 350º for 12 minutes.