In a small bowl, add the milk and apple cider vinegar. Stir and let sit to allow the milk to curdle.
In a medium bowl, add all of the dry ingredients (cornmeal, oat flour, baking powder and salt) and mix well to combine.
Pour the milk and vinegar mixture into the dry mixture and add the applesauce and maple syrup. Stir well until everything is evenly incorporated.
Pour the batter into an 8x8 inch pan lined with parchment paper, and place in the preheated oven for 20 minutes. Poke it with a toothpick to determine if it needs longer.
Once done, let cool for 10 minutes before slicing. Serve warm!
Notes
No oat flour? Make your own by grinding rolled oats in a food processor or blender. If not gluten-free, whole wheat flour works well too.Store leftovers in an airtight container on the counter for up to 3 days or the refrigerator for up to 5 days. Freeze for longer.