Banana Chocolate Coffee Cake

This cake is a MUST try! My brother requested it for his last two birthdays and we have made it for several other occasions as well.

Ingredients:

1 cup margarine
2 cups granulated sugar
2 eggs
1 teaspoon vanilla
2 1/2 cups mashed bananas (five bananas)
3 cups flour
2 teaspoons baking powder
2 teaspoons baking soda
1 cup sour milk
1/2 cup brown sugar
1 teaspoon cinnamon
2 cups chocolate chips


Cream margarine and sugar
Add eggs. Beat.
Add vanilla and mashed bananas.
Sift together flour, baking powder, and baking soda. Add to banana mixture alternately with sour milk.
Grease and flour a 9 by 13 baking pan.
Pour half the batter into the baking pan.
Combine together brown sugar and cinnamon in a bowl and sprinkle half of it over the batter in the pan. Then sprinkle half the chocolate chips over the batter.
Pour the rest of the batter into the pan, and then top with the rest of the cinnamon/sugar mixture and the rest of the chocolate chips.
Bake at 350 for 45-50 minutes.