Line a cookie sheet with parchment paper and set aside. Add the butter, brown sugar, cocoa powder, and almond milk to a pot over medium heat. Stir until the mixture comes to a boil. Let the ingredients boil for at least 1 minute but no longer than 2 minutes to prevent burning. Remove the pan from the heat.
Add the peanut butter, vanilla extract, and salt into the pot and stir until the peanut butter has melted and all the ingredients have combined well.
Then, add the gluten-free oats 1 cup at a time. You may not need all of the oats. You don’t want the mixture to be too runny, but you also don’t want it to be too dry.
Scoop the cookies onto the lined cookie sheet using a large spoon or cookie scooper.
Press the cookies down with a spoon to create a rounded shape and place the cookie sheet in the fridge for about 30-40 minutes to fully set. If desired, drizzle with melted peanut butter and top with Kosher salt.