In a medium sauce pan, add butter, sugar, milk and cocoa. Place on medium heat.
While you wait for the mixture to begin to boil, measure out your peanut butter and oats and have your vanilla jar handy. (once this process gets started – you have to work quickly)
Bring the mixture in the sauce pan to a rolling boil – once it is at a full boil – boil for 1 minute and 15 seconds.
Remove from the heat immediately.
Add in the peanut butter – stir. Add in the oats – stir. Add in the vanilla – stir.
Drop by tablespoons onto baking sheets lined with wax paper.
Let cool for 30 minutes or until set.