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.
Pour the chocolate peanut butter mixture over the oats and stir until combined.
Line a baking sheet with wax paper. Drop the cookies onto the wax paper using a medium cookie scoop.
Let the cookies cool on the countertop. Store in the refrigerator once cookies are cool and dry.
