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 until the sugar dissolves and the mixture is fully combined.
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, 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 cool undisturbed at room temperature for 10 to 15 minutes until they are firm and fully set.
08 - Once hardened, transfer the cookies to an airtight container. Store at room temperature for up to one week.