Beat butter and cream cheese until creamy. Gradually add sugar, beating until light and fluffy. Add eggs, one at a time. Combine flour and next three ingredients. Gradually add to butter mixture; beating on low just until blended. Stir in bananas, nuts and vanilla. Spoon batter into 2 greased loaf pans. Bake at 350 degrees for about 1 hour or until a wooden pick inserted in center comes out clean. Cool before slicing, if possible! Enjoy!