Preheat oven to 350F (175C). Grease a 9x5 inch loaf pan.

Sift together flour, sugar, baking powder, baking soda, and salt in a large bowl.

In a separate bowl, combine egg, milk, vegetable oil, and mashed banana.

Add chocolate chips to the wet ingredients (optional).

Pour the wet ingredients into the dry ingredients and mix until just combined. The batter should be lumpy.

Pour batter into the prepared loaf pan.

Bake for 65-70 minutes, or until a wooden skewer inserted into the center comes out clean.

Begin checking for doneness around 45 minutes to avoid overbaking depending on your oven's calibration.

Let cool in the pan for 10 minutes before transferring to a wire rack to cool completely.