Combine almond milk with apple cider vinegar; let sit for 5 to 10 minutes while you gather the rest of the ingredients.
Sift buckwheat flour, whole wheat flour, coconut sugar, baking powder, cinnamon, and salt in a medium bowl and combine.
Mash banana with a fork. Add along with vanilla to the milk mixture and combine with whisk.
Add liquid mixture to dry mixture and mix with a whisk. Let sit for 10 minutes.
Preheat waffle iron. Spray waffle iron with cooking spray. Pour waffle batter into waffle iron and cook according to manufacturer's instructions. Repeat this process as needed.
Serve. Top with pure maple syrup and sliced strawberries, if desired.
Notes
The calorie count does not include toppings. This recipe makes 2 whole Belgian waffle rounds (8 slices). Depending on how hungry you are and how you top the waffles, this recipe will make 2 to 4 servings.
Gluten-free: You may replace whole wheat flour with gluten-free rolled oats, ground in a blender to a fine-medium consistency, oat flour, or a gluten-free flour mix such as Bob's Red Mill.
If you wish to serve the waffles all at once, keep them in a single layer on a baking sheet with parchment paper or a silicone mat in a preheated oven set to 200°F.