INGREDIENTS
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1 stick butter, unsalted
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1/2 cup walnuts (optional)
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4 large ripe bananas
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1 tablespoon lemon juice
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1 teaspoon lemon zest (optional)
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1 1/2 cups all purpose flour
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1 teaspoon baking soda
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2 teaspoons salt
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3/4 cup sugar, plus extra for sprinkling on top
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2 eggs
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1/2 cup Greek yogurt (or sour cream)
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2 teaspoons vanilla extract
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1/2 cup bittersweet chocolate chips (optional)