Dice apples into small chunks. Toss the apple chunks with a little lemon juice to keep them from browning.
In a medium skillet over medium heat, add 1 tsp of neutral oil and add the diced apples. Sauté until the apples are softened and set aside.
In a bowl, mash banana throughly
In the same medium bowl, add the vanilla extract and softened apples and mix to combine.
To the mixing bowl add the oats, baking soda, baking powder and eggs. Optional, you can add 1 tsp of cinnamon.
Next add the almond milk and walnut pieces and fold together until combined.
Divide the muffin batter into a prepared muffin tin with cupcake liners or paper liners. Sprinkle with optional additional oats. Bake until golden brown and a toothpick comes out clean (about 20 minutes in a preheated oven).
Cool. Transfer muffins to a wire rack to cool completely before storing.
Notes
Nutrition facts are estimated and based on serving size of two muffins.