In a small saucepan over medium heat, whisk together the butter, sugar, milk, and cocoa.
Bring to a rolling boil and cook for about 1 ½ minutes. Remove from the heat.
Add the oats into the chocolate peanut butter mixture and stir until combined.
Divide the cookie dough into 4 – 6 equal portions and drop the cookies onto parchment lined cookie sheet about 1 inch apart.