01 - Line two baking sheets with parchment paper or silicone baking mats and set aside.
02 - In a medium saucepan over medium heat, melt the butter. Add the granulated sugar and whole milk, stirring constantly until the sugar fully dissolves.
03 - Bring the mixture to a gentle rolling boil while continuing to stir. Once it reaches a full boil, stop stirring and let it cook for exactly 1 minute to ensure proper cookie setting.
04 - Remove the saucepan from heat. Immediately stir in the creamy peanut butter, pure vanilla extract, and a pinch of salt until the mixture is completely smooth and uniform.
05 - Working quickly before the mixture begins to set, fold in the quick-cooking oats until every oat is thoroughly coated and well combined.
06 - Using a tablespoon or cookie scoop, drop rounded portions of the mixture onto the prepared baking sheets, spacing them about 1 inch apart.
07 - Allow the cookies to rest at room temperature for 10 to 15 minutes until fully hardened and set.
08 - Once completely cooled and firm, transfer the cookies to an airtight container for storage. They will keep at room temperature for up to one week.