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 sugar and whole milk, stirring until the sugar dissolves and the mixture is smooth.
03 - Bring the mixture to a gentle boil, stirring constantly. 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, vanilla extract, and a pinch of salt until the mixture is completely smooth and well blended.
05 - Quickly fold in the quick-cooking oats, stirring until every oat is thoroughly coated and the mixture is evenly combined. Work swiftly before the mixture begins to firm up.
06 - Using a tablespoon or cookie scoop, drop rounded portions of the mixture onto the prepared baking sheets, spacing them about 2 inches apart.
07 - Allow the cookies to cool undisturbed at room temperature for 10 to 15 minutes until fully hardened and set.
08 - Once the cookies have completely hardened, transfer them to an airtight container. Store at room temperature for up to one week.