Preheat oven to 350, grease 9x5 loaf pan. .
Mix together melted butter and sugar, then add in eggs and vanilla.
Combine flour, baking soda and salt, then add to butter mixture.
Add in sour cream, bananas and chocolate chips, then spread into loaf pan.
Bake at 350 for 50-60 minutes, until baked through.
Cool on wire rack in pan, then remove from pan to finish cooling.