Grandma's Banana Cookies
Ingredients:
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4 cups all-purpose flour
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2 teaspoons baking powder
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1 teaspoon salt
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1 cup mashed ripe banana
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½ cup sour cream
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1 teaspoon vanilla extract
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1 cup margarine
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1 cup white sugar
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2 large eggs
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1 teaspoon baking soda
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1 cup chopped walnuts
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½ cup unsalted butter
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1 cup brown sugar
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¼ cup milk, or more as needed
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2 ½ cups powdered sugar, or to taste