Preheat the oven to 350°F (176°C).
In a small bowl, combine ¾ cup high protein non-dairy milk with 1 teaspoon apple cider vinegar. Set aside for 5 to 10 minutes to curdle to make a vegan buttermilk/
Mash the 1 cup butternut squash puree and 1 ½ ripe bananas with the back of a fork in a separate medium-sized bowl.
In a large bowl, whisk together the ¾ cup + 2 teaspoons all purpose flour, 1 cup vital wheat gluten, 2 scoops of protein powder, 2 tablespoons organic sugar, 1 teaspoon ground cinnamon, ½ teaspoon ground nutmeg, and 1 tablespoon baking powder.
Then, add in the butternut squash and banana mixture, as well as the vegan buttermilk. Mix to make a thick batter.
Spread into a baking loaf pan. I like to like mine with parchment paper. You can sprinkle with cinnamon if desired.
Bake at 350°F for 50-60 minutes. Stick a toothpick in and it should come out clean.
In a small bowl combine the 3 tablespoons organic powdered sugar with 1 to 2 teaspoons of water. It should be able to drizzle off the spoon.
Remove the loaf pan from the oven and let it cool for 15-20 minutes. Then, pour the glaze over top. Spread around with a spoon.
Cut into as many pieces as you like and enjoy.