Step 1

Pre-heat oven to 350°F (180°C).  Grease and flour an 8 inch square or 9 inch round cake pan.

Step 2

In a medium bowl whisk together flour, baking powder, baking soda and salt.

Step 3

In a medium bowl beat together butter, sugar and vanilla, until light and fluffy (approximately 3 minutes), add the egg and beat, add the mashed bananas and beat to combine.

Step 4

To the creamed mixture alternately add the dry ingredients with the sour milk, beat on high until smooth.

Step 5

Pour into prepared cake pan and bake for approximately 30-35 minutes or until a toothpick comes out clean or with a few crumbs attached.  Let cool completely before frosting. Enjoy!

Step 6

In a medium bowl beat butter and cream cheese until creamy approximately one minute. Add icing sugar a little at a time, continue beating, add the cream beat approximately 3 minutes until fluffy.  Depending how you like your frosting, if too thin add more powdered sugar, if too thick add a drop of cream.