On your stovetop, melt the butter, milk, sugar, cocoa, and salt together at medium heat.
Turn up the heat to bring the mixture to a rolling boil, and boil for 2 minutes. Remove from heat.
Stir in the vanilla extract. Then mix in the peanut butter until completely mixed in. Lastly, mix in the quick oats.
Using a tablespoon or cookie scoop, drop spoonfuls onto a baking sheet lined with parchment or waxed paper. Let sit for an hour, or until completely set.