Banana Coffee Cake

Cake:
1C butter
1 1/2 C sugar
2 eggs, beaten
1 tsp vanilla
3 bananas, mashed
3 C flour
2 tsp baking soda
2 tsp baking powder
1 C sour milk (in bottom of cup add 1 T vinegar then top with milk)

Topping:
1 tsp cinnamon
1/2 C brown sugar
1 1/2 C chocolate chips

Mix first five ingredients. Mix dry ingredients in separate bowl. Add the sour milk alternately with the dry ingredients to the banana mixture. Place half the batter in a 9 x 13-inch pan and sprinkle with half the topping.  Repeat the layers and bake at 350 degrees for about 35-40 minutes or until a toothpick comes out clean in the center. Serve with generous dollop of whipped cream.