Preheat the oven to 350 degrees F.
In a large bowl add the wet ingredients (mashed banana, grated apple, grated carrots, egg, coconut oil, and vanilla. Mix together.
In a separate bowl, add the dry ingredients (almond flour, iron fortified infant oat cereal, cinnamon, baking powder, and baking soda). Stir to combine.
Add the wet ingredients into the bowl with the dry ingredients. Mix together.
Dish out the batter into a greased muffin pan. Bake in the oven at 350 degrees F for 22-25 minutes.
Let cool for 5-10 minutes.