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, mash the bananas until smooth.
Add the eggs, melted coconut oil, honey (or maple syrup), and vanilla extract. Mix until well combined.
In a separate bowl, whisk together the gluten-free flour, baking soda, baking powder, cinnamon, nutmeg, and salt.
Gradually fold the dry ingredients into the wet ingredients. Stir until just combined; do not overmix.
If using, fold in the walnuts or chocolate chips.
Pour the batter into the prepared loaf pan and smooth the top with a spatula.
Bake for 50-55 minutes, or until a toothpick inserted into the center comes out clean.
Allow the bread to cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.