- Cream margarine and sugar, beat in eggs, bananas, buttermilk and vanilla. Stir in remaining ingredients just until well combined. Spread batter into 2 greased and floured 8 1/2x4 1/2-inch loaf pans. Bake in a preheated 350 F oven until deep golden brown (about 65 minutes). Remove from pans, cool on wire rack.