Preheat your oven to 350°F (175°C). This ensures that your bread bakes evenly.
In a small bowl, mix the ground flaxseed with water. Let it sit for about 5 minutes until it becomes gelatinous. This will act as your egg replacement.
In a large mixing bowl, whisk together the all-purpose flour, baking soda, baking powder, and salt until well combined.
In another bowl, combine the mashed bananas, brown sugar, melted coconut oil, vanilla extract, and the prepared flax egg. Mix until everything is well incorporated.
Pour the wet ingredients into the dry ingredient bowl. Gently fold the mixture together using a spatula until just combined. Be careful not to overmix; a few lumps are perfectly fine.
If you’re using chocolate chips or other add-ins, fold them into the batter at this stage.
Grease your loaf pan or line it with parchment paper. Pour the batter into the prepared pan, smoothing the top with your spatula.
Bake in the preheated oven for 50-60 minutes, or until a toothpick inserted into the center comes out clean.
Once baked, allow the bread to cool in the pan for about 10 minutes. Then, transfer it to a wire rack to cool completely. Slice and enjoy your Vegan Banana Bread!