Preheat the oven to 350°F. Prepare muffin pans by lining them with paper liners or spray with vegetable spray.
In a food processor combine the flour and cornstarch and pulse for several seconds until the ingredients are well-combined. Add baking soda, baking powder, sea salt, and ground flax seed. Pulse again until the ingredients are combined. Set aside.
In a medium bowl, combine the sugars, peanut butter, and margarine. Use a mixer on medium-high speed until light and fluffy. Add the Apple Cinnamon Oatmeal baby food, vanilla, soy milk, and apple cider vinegar and mix again until the ingredients are well-combined.
Pour the flour mixture into the wet ingredients, add the chopped apples and stir until just combined.
Fill each muffin paper (or prepared muffin pans) with batter until approximately ¾ full. Generously sprinkle each muffin with prepared Coconut Cinnamon Crumble.
Bake for 20-25 minutes. You can test to see if the muffins are done by inserting a toothpick into the center of one of the muffins. If it comes out clean, the muffins are done.
Set aside to cool for about 10 minutes before removing the muffins from the pan. Store in an airtight container.