- Preheat the oven to 350°F (175°C) and grease a 9×13 inch baking dish.
- In a large bowl, mix the mashed bananas, melted coconut oil, honey (or maple syrup), eggs, and vanilla extract until well combined.
- In another bowl, whisk together the gluten-free flour, baking powder, baking soda, ground cinnamon, and salt.
- Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Fold in the walnuts if using.
- Pour the batter into the prepared baking dish and spread evenly.
- In a small bowl, mix the brown sugar and cinnamon for the topping, then sprinkle it over the batter.
- Bake for 25-30 minutes or until a toothpick inserted in the center comes out clean.
- Let the cake cool for a few minutes before serving.
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