In a large bowl whisk together the peanut butter and maple syrup until smooth. If your peanut butter isn't runny, you can use an immersion blender or blender cup for this step.
Add in the oats, chia seeds, salt and cinnamon and mix well.
Line a 12-count muffin tray with paper liners and scoop about 2 tbsp of mixture into each cup. Flatten it down using the back of a spoon or your finger.
Add the chocolate chips and coconut oil to a microwave safe bowl and microwave in 30-second increments until smooth. Once smooth, add in the peanut butter and mix well.
Pour the chocolate over each oat cup.
Top with flakey salt if desired and freeze for about an hour to set.
Keep stored in the fridge for up to 2 weeks or freezer for up to 2 months.