Preheat oven to 350°F. Spray 9x5 loaf pan with nonstick spray.
Place sliced bananas and coconut oil in nonstick skillet and turn heat to medium-low.
Heat, stirring continually, until coconut oil has melted and is mostly absorbed. About 3-5 minutes.
Add maple syrup. Cook, stirring continually, until absorbed. Add ¼ tsp. cinnamon mix until mixture is very soft and no longer sticking to pan.
Remove pan from heat and pour banana mixture into large bowl. Set aside.
Combine salt, baking powder, and flour in medium mixing bowl. Set aside.
Add applesauce, yogurt, vanilla, and cinnamon to bananas. Mix until fully combined.
Add eggs. Mix until fully combined.
Add flour mixture to banana mixture. Stir until combined and no dry flour remains. Add walnuts if desired.
Add remaining ¼ cup of coconut oil to mixture, one tablespoon at a time. Mix until combined.
Pour banana mixture into prepared loaf pan. Bake until knife comes out clean or internal temp is 200°F. (Approx. 50-55 minutes).