Preheat oven to 375 degrees F, line 12 muffin tin with muffin liners and spray with cooking spray. Set aside.
In a large mixing bowl, mash bananas with a fork or potato masher. Add an egg, applesauce, maple syrup, oil, vanilla extract, cinnamon, baking powder, baking soda and salt. Whisk well to combine until there are no visible lumps.
Add flour and gently stir until well incorporated. Do not over mix otherwise muffins will be tough.
Now add carrots, raisins and walnuts. Mix gently just enough to combine.
Using regular ice cream scoop, divide batter between openings evenly (they will be full) and bake for 20-22 minutes or until a toothpick inserted in the centre comes out clean.
Remove banana carrot muffins from the oven, let them cool for about 5 minutes and then transfer to a cooling rack to cool off more. Enjoy warm or cold.
Notes
Store: Loosely covered on a counter for 2 days. Muffins are moist, so do not seal them tight. After they can last in the fridge for a couple more days.
Freeze: In an airtight container or bag for up to 3 months. Thaw on a counter for a few hours or overnight.
Bananas: Choose very ripe bananas that are yellow with many brown spots to brown patches.
Liquid sweetener: No dry sweetener like sugar please. You have to keep dry to wet ingredients ratio.
Sweetened or unsweetened applesauce: Either can be used. Can substitute with yogurt 2% and higher fat content. Please do not use non-fat yogurt and add 2 more tablespoons of maple syrup.