Preheat oven to 350°F. Grease a 8x5 inch loaf pan with baking spray.
In a medium bowl, combine the dry ingredients; flour, baking powder, baking soda and salt with a wire whisk. Set aside.
In a large bowl cream coconut oil, apple sauce and sugar with an electric mixer or stand mixer. Add egg and vanilla, and beat at medium speed until thick.
Scrape down sides of the bowl.
Add 1/2 of the dry ingredients and blend at low speed until combined, add remaining 1/2 of the dry ingredients and the mashed bananas and blend at low speed until batter is combined. Do not over mix.
Pour the batter into the loaf pan and bake on the center rack for about 45 to 50 minutes, or until a toothpick inserted in the center comes out clean, but moist.
Let the pan cool at least 10 minutes, bread should be room temperature before slicing.