In a large bowl, stir together the oats and salt. Set aside.

In a small saucepan, over medium-high heat, whisk together the butter, sugar, milk, and cocoa. Bring the mixture to a boil for about a minute and then remove from heat.

Whisk in the peanut butter and vanilla until well combined, creating a smooth and creamy mixture.

Pour the chocolate peanut butter mixture over the oats and stir until the oats are well coated.

Line a baking sheet with wax paper. Using a medium cookie scoop, drop the cookies onto the wax paper.

Let the cookies cool on the countertop, and once they’re firm and dry, store them in the refrigerator.