In a jar or bowl, add the vinegar and ground flax meal to the plant milk, stirring to combine. Set aside.
In the container of a high powered blender add just 3 cups of rolled oats (set the remaining cup of oats aside) process until the oats turn into a flour. Empty into a bowl and set aside.
In the same blender container, add the plant milk, apple cider vinegar mixture, peeled bananas, blend until smooth and creamy.
Add the ground oats, buckwheat flour, vanilla powder, cinnamon and nutmeg to the blender. Process until well combined, use the tamper to help it blend. When well blended stir in the remaining 1 cup of rolled oats. This adds a nice rustic look and texture. Add more plant milk if needed.
Preheat a non stick waffle iron according to the manufactures instructions. For my waffle iron I set it on level 4. When the waffle iron is ready, spoon batter onto it and spread out the batter evenly. Close the lid and don't peek for 8 - 9 minutes. 9 minutes seems to work perfectly for my Cuisinart Begian Waffle Maker. Check the waffles, remove if they look like they are browned and cooked all the way through. Put on a cooking rack. Repeat with remaining batter.
The batter gets thicker as it sits, if it gets to thick add 2-4 tablespoons of plant milk and give it a stir.
Serve with maple syrup, date syrup, nut butter, cooked apples, blueberry sauce, warm applesauce, or fresh fruit, a sprinkle of unsweetened coconut and a dusting of cinnamon and freshly grated nutmeg.