Preheat oven to 350 degrees.
Grease your 9"x5" loaf pan.
Cream your softened butter with your sugar. Use your stand mixer or hand mixer.
Add in your eggs, and mix well.
Add your bananas and mix well.
Add your milk and vanilla and blend slightly.
Fold in your dry ingredients; flour, baking soda and salt. Do NOT overmix.
Roughly chop your chocolate. Leave some bigger than others. Fold all of the chocolate and the shards on your cutting board into your batter.
Scrape into your prepared pan.
Bake for 60 minutes. Test with a toothpick that the center is fully cooked (toothpick comes out clean).
It'll sink in the middle if you don't fully bake it. Add up to 5 minutes extra baking time if your oven is a little different than mine.