Banana Cake

3 bananas
1/2 cup sour milk (1 teaspoon vinegar in milk)
1/2 cup shortening
1 1/2 cups sugar
2 eggs
1 teaspoon vanilla
2 cups flour
1/2 teaspoon baking powder
3/4 teaspoon baking soda
1/2 teaspoon salt

Add milk and bananas and mash. In separate bowl combine shortening, sugar, eggs, vanilla. Add dry ingredients, add milk/banana mixture to other ingredients. Pour into 9x13 cake pan. Bake at 350 degrees for about 30 minutes until top is brown and tooth pick comes out clean.