move oven rack to lowest position so top of pan is in the center of oven. heat oven to 350. grease or spray a 9X13 pan.
mix sugar and butter in large bowl. stir in eggs until well blended. add bananas, buttermilk and vanilla. beat until smooth. stir in flour baking soda and salt just until moistened. stir in nuts.
( i sometimes add 1 cup chocolate chips and 1 cup butterscotch chips for a nice twist)
bake for 1.25 hours or till tooth pick comes out clean or a butter knife. cool and loosen sides with butter knife best if served warm with butter on it!! : )