3-Ingredient Protein Banana Cake

1. Mix all ingredients. You can optionally add about 1/2 cup mini chocolate chips. 
2. Pour the batter into a prepared pan. 
3. Bake at 325°F (160°C) for 20-25 minutes. The cake will be done before it looks completely cooked through; use a toothpick test to ensure it's ready. Let it cool for at least an hour before proceeding to the optional step 4. 
4. Optional, but recommended: Melt chocolate with a little coconut oil to thin it out for better spreading. Drizzle over the cooled cake and sprinkle with flaky salt. Let the chocolate set. 
5. Enjoy!