Preheat oven to 350˚F (180˚F).
In a bowl, add the bananas and mash until smooth.
Add milk and cinnamon to banana mixture
In another bowl, mix flour, baking powder, baking soda, and salt
Set second bowl aside
In a third bowl, mix butter and sugar until well combined
Add egg to butter/sugar mixture one at a time, beat each egg well
Stir banana mixture into butter/sugar mixture
Add vanilla extract
Stir in dry mixture until well combined
Fold in chocolate chips
Pour batter into greased 9x13 pan
Bake for 60 minutes or until a toothpick comes out clean.
Cool completely before serving (about 10 mins)
Enjoy!