Instructions:Preheat oven to 400F (200C). Grease 12-cup muffin tin; set aside.
In a large bowl, mix together bananas, eggs, sweetener, milk, oil, ground flax seeds and vanilla. In separate bowl, combine oats, almond flour, baking powder and salt; stir into banana mixture just until combined. Stir in chocolate chips.
Spoon batter into prepared muffin tin; sprinkle with walnuts. Bake for 18 to 20 minutes or until toothpick comes out clean when inserted into center of a muffin. Let cool in pan for 5 minutes. Transfer to rack; let cool completely.