In a medium-sized saucepan, combine the brown sugar, cocoa powder, almond milk, and salt. Stir together until well mixed.
Place the saucepan over medium heat, stirring constantly. Bring the mixture to a gentle boil, then allow it to boil for about 1 minute.
After one minute, promptly remove the saucepan from heat. Stir in the peanut butter and vanilla extract. Mix until the ingredients are thoroughly integrated and the mixture is smooth and glossy.
Next, add the quick oats to the chocolate mixture. Stir vigorously until the oats are completely coated. If desired, fold in chocolate chips or nuts at this stage for an exciting crunch.
Line a baking sheet with parchment paper to prevent sticking. Using a spoon or cookie scoop, drop spoonfuls of the cookie mixture onto the parchment paper. Shape them into round cookie forms with your hands or the back of the spoon.
Refrigerate the cookies for at least 30 minutes to allow them to set and firm up.
Notes
For an elegant touch, drizzle melted chocolate over each cookie and sprinkle with flaky sea salt before serving.