1. preheat oven to 325 degrees.
2. Cream butter and sugar. Add eggs, applesauce, vanilla and bananas. Mix thoroughly.
3. Slowly add flour, cocoa, baking soda and salt. Blend at low speed until just combined. Be careful not to overmix.
4. Stir in chocolate chips.
5. Evenly divide mixture into 12 lined muffin cups.
6. Bake for 25-30 minutes or until a toothpick comes out clean.