Lightly spoon flour into dry measuring cups, and level with a knife. Combine flour and next 4 ingredients (flour through salt) in a large bowl; make a well in center of mixture. Combine banana, buttermilk, oil, and egg substitute in a bowl; add to flour mixture. Stir just until moist. Spoon batter into an 8 x 4-inch loaf pan coated with cooking spray.
Combine 1/4 cup oats, walnuts, 2 tablespoons brown sugar, and butter, and sprinkle over batter. Bake at 350° for 1 hour or until a wooden pick inserted in center comes out clean. Cool 5 minutes in pan on a wire rack; remove from pan. Cool completely on wire rack.
Good, easy banana bread recipe. Never have buttermilk in the house, so replaced it with slightly less than half a cup of yogurt and a splash of skim milk. Ended up with a wonderfully soft, dense bread, though it only took about 45 minutes to pass the toothpick test.
A little bland, without the nuts mixed in and with only banana flavor. Will add about a teaspoon of cinnamon and nutmeg next time, and that will probably make it 5 stars.
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