Preheat your oven to 350°F (175°C). Grease a 9x5-inch loaf pan or line it with parchment paper.
In a large mixing bowl, combine the oat flour, almond flour, protein powder, baking soda, baking powder, and sea salt. Mix well to combine.
In a separate bowl, mix Greek yogurt, maple syrup, mashed bananas, eggs, and vanilla extract until smooth.
Pour the wet ingredients into the dry ingredients and stir until just combined. Be careful not to overmix.
Gently fold in the chocolate chips until evenly distributed throughout the batter.
Pour the batter into the prepared loaf pan, spreading it out evenly. Sprinkle additional chocolate chips on top if desired.
Bake in the preheated oven for 50-60 minutes, or until a toothpick inserted into the center comes out clean.
Remove the banana bread from the oven. Let it cool in the pan for 10 minutes. Then, transfer it to a wire rack to cool completely.
Once cooled, slice and serve. Enjoy!