Combine ground flaxseed and 3 tbsp of boiling hot water in a small bowl to make a flax egg. Mix well and set aside.
Combine almond milk and apple cider vinegar in a measuring cup, stir thoroughly, and set aside.
Add flour, baking powder, salt, and sugar to a medium-sized bowl and mix well.
Return to your almond milk mixture and add in oil, the flax mixture, and vanilla. Mix well.
Slowly pour your wet mixture over your dry ingredients. Stir until few lumps remain (but don’t overmix).
Cook the waffles according to your waffle maker’s instructions - my small waffles took 8 minutes per waffle.
Serve with fresh fruit, chocolate sauce, maple syrup or other toppings of your choice.