Add warm water, melted coconut oil, and mashed banana to the bowl of a stand mixer.
Add flour, buttermilk powder, gluten, and salt.
Make a well in the center of the dry ingredients. Add yeast to the well. (Make sure the yeast doesn't touch the salt.)
Fit mixer with dough hook. Mix on speed 1 5-8 minutes or until a dough ball forms and cleans the sides of the bowl.
Spray loaf pan with cooking spray. Add dough to loaf pan and shape into a loafy shape. Cover with a clean kitchen towel and let rise 1-2 hours or until doubled in bulk.
Preheat oven to 400. Bake 25-30 min or until crust is browned and loaf sounds hollow when tapped. Remove from oven. Remove loaf from pan and place on a cooling rack. Cool completely. Slice and freeze, or slice and serve.