Preheat the oven to 350°F degrees and prep pan: Cut a piece of parchment paper the length of the loaf pan and about 3x the width. Place paper in pan with edges hanging over the side of the loaf pan like flaps, and grease the paper and the pan. I use baking spray, but grease it as you like. (This all helps to lift the bread right out of the pan once it cools after baking). Set aside.
Mash the bananas in a bowl. Mix the egg with the sugar and oil and stir into the bananas.
Combine flour and dry ingredients: Place a fine mesh sieve set over the wet ingredient, add the flour, baking powder, baking soda ,and salt. Or you could also whisk them together in a small bowl. Sift the dry ingredients into the mixing bowl over the banana mixture.
Stir dry with wet: Gently combine the dry ingredients into the banana mixture until just combined and no large streaks of flour appear. Try not to over-mix the batter, the batter will be a little lumpy. Stir in the milk, and scrape the bottom and sides of bowl to leave no dry streaks of flour mixtures.
Fold in chocolate chips (nuts, or whatever else you're adding in). Reserve about ¼ cup of the chips to sprinkle on top of batter.
Spoon into your prepped baking pan and bake. Sprinkle on the remaining ¼ cup of chocolate chips on the top of batter. Bake at 350 F for 55-60 minutes, until loaf is golden brown and a toothpick inserted in middle comes out clean. Start checking at 55 minutes, could take up to 65 minutes. Allow to cool in pan for 10 minutes, then remove to a wire rack to cool completely. Tastes great even the next day! Slice and Enjoy!