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1
Put oven rack in middle position and preheat oven to 350F.
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2
Grease a 9- by 5-inch loaf pan and line bottom of pan with wax paper or parchment, then grease paper.
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3
Mix together milk and lemon juice and let stand until milk curdles, about 1 minute.
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4
Whisk together flour, baking powder, salt, and baking soda in a bowl.
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5
Beat together butter and sugar in a large bowl with an electric mixer at high speed until pale and fluffy, about 2 minutes.
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6
Add eggs, 1 at a time, beating until combined, then beat in bananas until combined.
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7
(Mixture will look curdled.)
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8
Add flour mixture to banana mixture alternately with milk, mixing at low speed just until batter is smooth.
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9
Stir in walnuts.
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10
Pour into loaf pan and bake until a wooden pick or skewer inserted in center of bread comes out clean, about 1 hour.
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11
Cool bread in pan on a rack 20 minutes, then invert bread onto rack.
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12
Remove paper and turn bread right side up on rack to cool completely.
