Combine butter, milk, sugars, and cocoa powder. Cook over low heat until butter melts, stirring occasionally. Do not turn up heat to make the process go by faster.
Once boiling, turn heat up to medium, stirring constantly.
Continue boiling for 1 minute and then take off heat. (Set a timer to prevent overcooking.)
Add in peanut butter and vanilla extract and stir.
Add in oats and stir again.
Add in chopped dark chocolate and give a quick stir (Don’t mix it in completely. You want a little bit of a chocolate swirl.)
Drop onto parchment lined sheet pan.
Chill for 30 minutes.
Store in an airtight container.
