Preheat oven to 325°F. In a large bowl, cream butter and sugar. Then mix in eggs, vanilla and sour cream.
In a separate bowl, whisk together flour, baking powder, baking soda, and salt. Slowly add flour mixture to sugar mixture and stir until combined. Fold in bananas and chocolate chips.
Pour into 2 (8x4") loaf pans and bake for 55 minutes. If using a 9x5" pan, you can put the batter into one pan, but you will need to cook 10-15 minutes longer. You want the bread to be lightly browned. If it's browning too fast, cover lightly with foil. Remove from oven once a toothpick comes clean.
Once the bread is slightly cooled, remove from the pan and place on a cooling rack. Slice and enjoy with a cold glass of milk!
