Set aside the oatmeal & peanut butter in a bowl.

Combine the sugar, butter, milk, and cocoa in a saucepan.

Cook until mixture reaches a boil, stirring frequently. Let the mixture boil hard for one minute (do not stir during this time).

Remove from heat and add oatmeal, peanut butter and vanilla.

Once the mixture is well-blended, drop by spoonfuls onto wax paper.