Preheat your oven to 350°F (175°C) and grease an 8×4-inch loaf tin or line it with parchment paper.
In a large bowl, mash the ripe bananas until smooth. Add the granulated sugar, brown sugar, plant milk, oil, and vanilla extract, and stir until combined.
Add the dry ingredients: flour, baking soda, baking powder, salt, and cinnamon (if using). Stir until about 80% combined, leaving a few lumps.
Gently fold in the chocolate chips and walnuts, being careful not to over-mix.
Pour the batter into the prepared loaf tin and smooth the top with a spatula.
Bake for 55 to 60 minutes, or until a toothpick inserted in the center comes out clean or with a few dry crumbs.
Let the loaf cool in the tin for at least 10 minutes, then transfer to a wire rack to cool completely.
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Notes
Store at room temperature for 3 to 4 days. Freeze for longer storage, wrapping tightly.