Preheat oven to 350.
Beat butter and cream cheese until creamy.
Gradually add sugar, beat until light and fluffy.
Add eggs 1 at a time beating until just blended.
Gradually add the flour to the mixture, beating at low speed until just blended.
Stir in bananas, nuts and vanilla.
Spoon batter into two greased and floured 8x4 loaf pans.
Bake for 50-60 minutes. (if it starts getting too brown, put some aluminum foil over the top.)
Remove from pans and cool on wire rack.
