01 - Line two baking sheets with parchment paper to set aside for later use.
02 - In a medium saucepan, combine butter, sugar, milk, and salt. Bring the mixture to a rolling boil over medium heat, stirring occasionally. Boil for exactly 1 minute.
03 - Remove the saucepan from heat. Stir in the peanut butter and vanilla extract until the mixture is completely smooth.
04 - Add the quick-cooking oats to the saucepan and mix thoroughly to ensure all oats are evenly coated.
05 - Drop heaping tablespoons of the mixture onto the prepared baking sheets. Flatten each mound slightly with the back of a spoon.
06 - Allow the cookies to stand at room temperature for at least 15 minutes, or until they are firm and set.