Preheat oven to 350˚F. Butter the loaf pan.
Mash and mix oil, sugar, and bananas into a bowl. Don't waste the stringy parts.
Add in egg and vanilla.
Add the almond flour and protein powder and mix into the bowl.
Combine the all purpose flour, baking soda, and baking powder in a measuring cup, then add to the mix. Add any add-ins you'd like. Stir batter until just combined.
Pour into loaf pan and bake at 350˚F for about 55 minutes.
Don't worry if it sinks a bit. Best taste if cooled completely!