Preheat oven to 350°F (175°C).
Grease or line a 9×5 loaf pan with parchment paper.
In a large bowl, whisk together the gluten-free flour, erythritol, baking powder, baking soda, and salt.
In a separate bowl, whisk together the banana, eggs, milk, avocado oil, vinegar, vanilla, and maple syrup (if using).
Add the wet ingredients to the dry ingredients and stir just until combined. Do not overmix.
Pour into the prepared loaf pan.
Bake for 45–55 minutes, or until a toothpick inserted in the center comes out clean or with a few moist crumbs.
Cool completely before cutting circles for the dot cakes.