If using ground flax seeds as your egg replacer, put them in the dry blender and pulse until finely ground. Add 2 T. water and let sit five minutes. This creates your binder. Put the next nine ingredients (through salt) into the blender and pulse a few times until well blended. (If using egg, just put the first ten ingredients into the blender and pulse.)
Pulse in the buckwheat flour, then the gluten-free blend just until mixed. Batter will thicken as it stands. Add more milk as needed.
Follow the instructions for filling and baking your waffle iron, being careful to spray the iron each time with cooking spray. I use a 1/4 cup measure on each side of the waffle iron.
Serve with a small amount of heart-healthy margarine and maple syrup. Diabetics can substitute a small amount of agave syrup instead of maple syrup.