Preheat oven to 350 degrees F and line a standard muffin tin with 10 paper liners, or lightly grease 10 tins and coat with flour. Shake out excess.
Prepare flax eggs by combining flax seed meal and water in a large mixing bowl and let rest for 5 minutes.
Measure out almond milk in a liquid measuring cup and add apple cider vinegar and baking soda. Whisk to combine and set aside.
To the flax egg, add maple syrup, cane sugar, melted vegan butter (or oil) and whisk vigorously for 1 minute to dissolve sugar.
Add applesauce and salt and whisk to combine. Then add almond milk mixture and whisk again to combine.
Add almond meal, cornmeal and flour and whisk until just combined and no large lumps remain. The batter should be quite thick and scoopable. Add blackberries dusted with flour and gently fold into the batter.
Scoop batter into muffin tins until almost full - there should the perfect amount for 10 (or 11) muffins.
Bake on a center-positioned rack for 25-30 minutes or until a toothpick inserted into the center comes out clean.
Let cool for 15-20 minutes in the pan (to continue baking/firming up a little), then loosen with a butter knife and gently lift out.
Let cool completely on a plate or cooling rack.