Old-Fashioned Fragrant Banana Bread

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   ["Preheat oven to 350u00b0F.", "Line a baking sheet with parchment paper.", "Generously spray a 9"" x 5"" loaf pan with nonstick cooking spray and place pan on a parchment paper-lined baking sheet.", "In a mixer bowl, cream butter and sugar until well blended.", "Add eggs, banana, sour cream, and vanilla.", "Fold in flour, baking powder, baking soda, and salt, scraping bowl often.", "Mix on low speed; then fold in walnuts.", "Spoon batter into prepared pan.", "Bake until bread springs back when gently pressed with fingertips, 50 to 55 minutes (it may have a crack in the center, this is common).", "If bread seems not quite done, reduce oven temperature to 325u00b0F and bake 10 to 15 more minutes.", "Cool in pan 20 minutes; then turn out and cool on a wire rack."]

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