Chocolate no-bake cookies

Very similar to the last recipe but you need to follow this carefully as well. No substitutes!

½ cp butter
½ cp cocoa
1 ½ cp sugar
½ cp milk
1 tsp vanilla
3 cps quick oats
Optional: ½ cp coconut

Combine butter, cocoa, sugar and milk in saucepan. Cook 3 minutes. Add vanilla. Pour over oats. Add coconut if desired. Shape quickly into balls and place on wax paper to cool.