1. Line a baking sheet with parchment or wax paper
2. In a large heavy pot, combine the butter/oil, sugar, milk, vanilla, and cocoa powder. Heat over medium heat until it starts to bubble, then set a timer and let simmer for exactly 1 minute.
3. Immediately turn off and remove from the heat and stir in the peanut/nut butter, oats (dry mix), and salt until combined
4. Working quickly, drop about 2 tablespoons of the mixture at a time onto the paper-lined sheet pan, pressing gently on the tops of each cookie to flatten slightly or make it smaller and taller. Sprinkle the tops with more salt (optional)
5. Let the cookies sit at room temperature until cool and set. Store in an airtight container for 5 days or freeze for up to 6 months.