Chocolate Banana bread

2 medium bananas (about 1 cup), over-ripe
6 oz (3/4 cup) plain 2% Greek yogurt OR Applesauce OR Sour Cream
1 large egg
1/4 cup canola oil
1/4 cup whole milk
1 tsp pure vanilla extract
2/3 cup granulated sugar
1 Tbsp (packed) light brown sugar
2 Tbsp natural unsweetened cocoa powder
1/2 tsp sea salt
1-1/4 tsp baking soda
1-2/3 cups all-purpose flour
optional: 1/4 cup semisweet or bittersweet chocolate, chopped and chopped walnuts

INSTRUCTIONS

1. Preheat the oven to 375° ­. Lightly grease a 9x5 loaf pan. Set aside.
2. In a large mixing bowl, use the back of a fork to mash the banana until only very small lumps remain. Add the yogurt and the egg and use the fork to whisk the mixture together until completely combined. Add the oil, milk, and vanilla, and stir to combine. Add the sugars and stir again.
3. Using a spatula, stir in the cocoa powder, scraping down the sides of the bowl as necessary. Mix until the cocoa is completely incorporated. Stir in the salt and baking soda, then gently fold in the flour, until just combined.
4. Fill loaf pan *these could be made as muffins too**.
5. Bake for 16-19 minutes, rotating once, until the muffin tops look set, and a cake-tester inserted into the center of the muffins comes out clean. Remove from the oven and let cool in the muffin tin for 5-10 minutes, before removing and cooling completely on a baking rack. Serve warm or at room-temperature