Preheat your oven to 350°F (175°C).

Grease your loaf pan with cooking spray or butter.

In a large bowl, mash the ripe bananas until smooth.

In a small bowl, whisk together the sweet rice flour, sugar, cocoa powder, baking powder, and salt.

In the bowl with the mashed bananas, add the vegetable oil, eggs, and vanilla extract and stir until combined.

Gradually add the dry ingredients to the wet mixture, folding gently with a spatula.

If using, fold in the chopped nuts or chocolate chips.

Pour the batter into your prepared loaf pan and smooth the top.

Bake for 50 minutes or until a toothpick inserted in the middle comes out clean.

Let the bread cool for at least 10 minutes in the pan before transferring it to a wire rack.