Add flour, baking powder, salt and cinnamon to a sifter and sift over wet ingredients. Stir until just combined. Gently fold in oats, then half of the apples. If batter appears too thick, add a little almond milk. Let batter rest for 5 minutes while preheating waffle iron.
Once done, remove and place on cooling rack to let steam roll off and crisp up a bit. Serve warm with vegan butter (such as Earth Balance) and maple syrup, and the leftover apples. Store in an airtight container in the freezer and warm in the toaster or oven.
*Nutrition information is a rough estimate calculated with apples on top but not maple syrup.