Line a large baking sheet with parchment paper and set it aside.
Place the butter, sugar, milk, and cocoa powder in a saucepan and heat over medium heat.
make sure, butter is melted and everything is well combined.
Bring the mixture to a boil and allow to boil for 60 seconds
Remove from the heat, and stir in the vanilla extract and peanut butter.
Add oats and mix until all of the oats are well coated with the mixture.
Drop a cookie scoop of the mixture onto the prepared baking sheets.
Allow cooling for 1 - 2 hours.