Boil sugar, butter,milk together for 3 minutes. Add the cocoa and oats and beat for 2 minutes. Drop by teaspoonful on wax paper. (Don't bake just cool). For variety add 1/3 cup crunchy peanut butter instead of cocoa. Peanuts may also be added.
Another variation: Use brown sugar and 1 cup coconut, instead of cocoa.