Preheat your oven to 375F (for 20 min) degrees and line or grease a muffin tin.
Prepare your batter by whisking together cornmeal, oat flour, tapioca starch and baking powder in a mixing bowl.
In a separate small bowl, add apple cider vinegar to coconut milk and let sit for about 5 minutes to thicken. Whisk in pumpkin purée or apple sauce and maple syrup until smooth.
Create a small well in the center of the dry ingredient bowl and add your wet ingredients, using a spatula to mix until combined.
Pour batter into your muffin tins and bake for 15-18 minutes, until tops are golden brown and muffins are cooked through.