01 - Line two baking sheets with parchment paper and set aside.
02 - In a medium saucepan over medium heat, combine the butter, sugar, milk, and cocoa powder. Stir frequently until the butter has melted and the mixture is smooth.
03 - Bring the mixture to a rolling boil and maintain the boil for exactly 1 minute, stirring constantly to prevent scorching.
04 - Remove the saucepan from heat. Immediately stir in the peanut butter, vanilla extract, and a pinch of salt until the mixture is completely smooth and well blended.
05 - Add the quick-cooking oats to the saucepan and fold them in thoroughly until every oat is fully coated with the chocolate mixture.
06 - Using a tablespoon or cookie scoop, drop rounded spoonfuls of the mixture onto the prepared baking sheets. Gently shape into round mounds if desired.
07 - Allow the cookies to cool and firm up at room temperature for 15 to 20 minutes. For faster setting, place the baking sheets in the refrigerator until the cookies are firm.