Mix the dairy-free “buttermilk”: In a measuring cup, whisk soy milk and apple cider vinegar. Let it sit for 3–4 minutes to slightly thicken.
Combine dry ingredients: In a large bowl, whisk oat flour, chickpea flour, ground flaxseed, sugar, baking powder, baking soda, salt, and cinnamon until evenly mixed.
Add wet ingredients: Stir vanilla, oil, and maple syrup into the buttermilk.
Pour into the dry mixture and gently fold with a spatula. Add 2–4 tablespoons more milk if needed. The batter should be thick but scoopable—not paste-like.
Rest the batter: Let it rest for 5 minutes.
This hydrates the oat flour and activates the flax for better binding.
Preheat and grease: Warm a nonstick skillet or griddle over medium heat. Lightly grease with oil or vegan butter.
Cook the pancakes: Scoop about 1/4 cup batter per pancake. Spread slightly with the back of a spoon.
Cook 2–3 minutes until the edges look set and small bubbles appear. Flip and cook 1–2 minutes more, until golden and springy.
Adjust heat as needed: If browning too fast, lower the heat; if pale and slow, slightly increase heat.
Serve with toppings: Stack warm pancakes and finish with your favorite protein-rich toppings and a drizzle of maple syrup.