Preheat oven to 375º. Line muffin tins with wrappers or use olive oil and flour to grease pan.
Mix quick oats, oat flour, coconut sugar, and stevia in a large bowl.
Combine flax and water in a small bowl to create flax eggs. Mix together and set aside.
Combine coconut milk and apple cider vinegar in a medium bowl. Mix together and set aside for 5 minutes.
Melt coconut oil.
Add coconut milk mixture, coconut oil, and flax eggs to the bowl of dry ingredients. Mix together using a fork until combined.
Scoop a small spoonful of batter into each muffin compartment. Add 3-5 blueberries, then cover with more batter until about 2/3 full.
Top with additional blueberries by gently pushing the berries into the batter [optional] and bake for 22-25 minutes.