Preheat the oven to 350°F (175°C). Grease a 9×5-inch loaf pan or line it with parchment paper.
In a medium bowl, whisk together the quinoa flour, baking soda, baking powder, salt, and ground cinnamon until well combined.
In a large bowl, mash the ripe bananas with a fork until smooth.
Add the honey, melted coconut oil, eggs, vanilla extract, and Greek yogurt to the mashed bananas. Mix well until fully combined.
Gradually add the dry ingredients to the wet ingredients, stirring gently until just combined. Do not overmix.
Pour the batter into the prepared loaf pan and spread it evenly.
Bake in the preheated oven for 45 to 50 minutes, or until a toothpick inserted into the center comes out clean.
Remove the banana bread from the oven and allow it to cool in the pan for 10 minutes.
Transfer the bread to a wire rack to cool completely before slicing and serving.