1. Line large baking sheets with parchment paper and set aside.
2. In a saucepan, combine butter, sugar, and milk over medium heat, stirring often.
3. Bring to a rolling boil and boil for 60 seconds without stirring.
4. Remove from heat, stir in peanut butter and vanilla bean paste until combined.
5. Stir in oats until fully coated.
6. Drop spoonfuls onto prepared sheets and flatten slightly.
7. Let cool for 45 minutes to 1 hour until firm.
Notes
Store in an airtight container at room temperature for up to one week.Cookies freeze well for up to three months; thaw at room temperature before serving.