Banana Coffee Cake

It's Sunday morning.  My refrigerator has 1 egg in it. Oops, grocery shopping error.  I also have 1 very ripe banana.  It was time to be creative and come up with breakfast.  I chose a coffee cake because it's Sunday morning and time to splurge a little.  It smells just like banana bread when you cut into it but the bonus is you get the cinnamon streusel topping.

Banana Coffee Cake

1 stick butter, softened
1 cup sugar
1 tsp vanilla
1 ripe banana, mashed
1/4 cup sour cream
1/2 tsp cinnamon
1/2 tsp salt
1 tsp baking soda
1 tsp baking powder
1/2 cup milk
2 cups flour

Topping

1/2 cup flour
1/2 cup dark brown sugar
6 tbsp cold butter

Cream together butter and sugar.  Add in vanilla, banana and sour cream.  Gradually add in the dry ingredients, alternating with adding in the milk.  Place the dough in a greased 9 x 9 pan.  In a bowl, add in the flour and dark brown sugar (you can use light brown sugar).  Blend together.  Gradually add in pieces of cold butter by using a blending tool or fork.  When all incorporated, sprinkle over the top of the cake batter.  Bake for 50 minutes at 350°.