Preheat oven to 350F and line a 12-count muffin pan.
Set aside.
Combine flax seed with stevia, baking powder, cinnamon and salt in a large bowl.
Whisk to combine fully and set aside.
Add eggs, water, oil and vanilla extract to your Vitamix or other high-powered blender.
Blend on high until foamy - about 20-30sec.
Combine liquid mixture with the flaxseed mixture.
Stir gently with preferably a spatula until combined.
The mixture will be very fluffy.
Let sit for 3-5 minutes.
Fold in the chocolate chunks to finish.
Spoon mixture into muffin pan almost 90% of the way up.
If you fill it up completely the muffin mixture will pour over when they rise.
Bake muffins for 13-15 minutes, or until a knife or toothpick comes out clean.
Remove from the oven and remove muffins right away and place on a cooling rack.
These freeze really well for up to three months and they're also yummy toasted.
They'll keep nicely in the fridge for up to 4 days