Melt Base: Combine butter, sugar, milk, and cocoa powder in a saucepan over medium heat, whisking until smooth.
Boil Syrup: Bring to a boil and let cook for exactly one minute.
Add Creaminess: Remove from heat and stir in peanut butter and vanilla extract.
Incorporate Oats: Add oats and salt, stirring to coat evenly.
Rest the Mix: Let sit for 5 minutes to thicken slightly.
Shape Cookies: Drop tablespoon portions onto parchment-lined trays.
Chill: Refrigerate 30–60 minutes until firm.
