Preheat the oven to 350 degrees Fahrenheit.
Add 1 1/2 cups mashed ripe bananas, 1/2 cup creamy peanut butter, 1/4 cup pure maple syrup, and 1 teaspoon vanilla extract to a large mixing bowl, then mix well.
Add 1 1/4 cups vital wheat gluten, 1 tablespoon baking powder, 1/2 teaspoon ground cinnamon, 1/4 teaspoon salt, and optional 1/2 cup vegan chocolate chips to a second mixing bowl, then mix well.
Transfer the dry ingredients to the bowl with the wet ingredients, then mix to combine.
Transfer the batter to a 9-inch loaf pan lined with parchment paper, then spread in an even layer.
Bake for 50 minutes or until a toothpick inserted into the center of the loaf comes out looking clean.
Let cool completely before removing from the pan.