Grease a 9×5-inch loaf pan and line the bottom with parchment paper.
Preheat oven to 350°F (175°C).
In a large bowl, whisk together flour, protein powder, baking soda, baking powder, salt, and cinnamon.
In another bowl, mix mashed bananas, yogurt, maple syrup, oil, and vanilla until smooth.
Combine wet and dry ingredients until just combined.
Fold in any optional mix-ins.
Pour the batter into the prepared pan and smooth the top.
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