In a 2 quart microwave safe bowl combine sugar and cocoa powder.
Stir in milk.
Stir in butter and corn syrup.
Microwave uncovered on high for 3-4 minutes, or until mixture is boiling rapidly, stirring once.
Microwave 3 minutes more, stirring every minute.
Stir in peanut butter.
Stir in oats.
Microwave uncovered on high for 1-2 minutes or until mixture is boiling rapidly.
Let stand 20 minutes.
Beat dot 3-5 minutes or until mixture has slightly thickened.
Quickly drop from rounded spoon onto waxed paper.
Let cool.