Place a piece of aluminum foil, approximately a foot long, out on the counter. You'll be scooping out the cookies on to this to let dry once they're finished cooking.
In a large sauce pan place butter, sugar, milk and cocoa and turn burner on to medium-high heat.
Stirring to combine, cook until butter has melted.
Next, and PRO TIP: Once all of the chocolate mixture starts boiling, (not just a bubble here and there -- wait until it all starts boiling) begin timing the boil, stir slowly and constantly, and let it boil for 1 minute.
After one minute of boiling, remove from heat
Mix in peanut butter and stir until combined
Add in oats and stir until evenly mixed
QUICKLY, using a spoon, scoop out a tablespoon of cookie mixture on to your prepared aluminum foil, making approximately 16-20 cookies.
Let cookies sit for about 20 minutes or until the cookies have hardened and you can pick them up off of the aluminum foil.
Video
Notes
TIP: Spread out a piece of aluminum foil on to the counter before you start making the cookies so it will be ready and you can quickly spoon out the cookies.