Preheat oven to 350°. Coat a 15x10x1-in. baking pan with cooking spray.

In a large bowl, beat butter and sugar until blended. Add eggs, one at a time, beating well after each addition. Add bananas, mixing well (mixture will appear curdled).

In another bowl, whisk flour, baking powder, salt and baking soda; add to butter mixture alternately with buttermilk, beating well after each addition. Fold in pecans.

Transfer to prepared pan. Bake 20-25 minutes or until a toothpick inserted in center comes out clean. Cool completely in pan on a wire rack.