Line a large baking sheet with parchment paper or a silicone baking sheet. Set aside.
Add peanut butter, coconut oil, maple syrup, and vanilla extract to a large microwave-safe bowl. Cover and place in microwave for 1 minute at 50% power. Remove from microwave and stir vigorously until smooth.
Add dark cocoa powder and salt to the peanut butter mixture and stir to combine.
Add oats, one-half cup at a time, and stir until oats are completely coated.
Add rounded tablespoons of peanut butter oatmeal mixture to prepared baking sheet. Place in freezer for a minimum of 30 minutes to set.
Remove from freezer and serve immediately. Store remaining cookies in the refrigerator until ready to serve or the cookies will lose their shape. Enjoy!