INGREDIENTS
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2 cups all-purpose flour, plus extra for pan
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1 teaspoon baking soda
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1/2 teaspoon table salt
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1/2 cup unsalted butter, at room temperature, plus extra for pan
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1-1/2 cups firmly packed light-brown sugar
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1 large egg
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1 cup sour cream
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1 teaspoon vanilla extract
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2-1/2 cups fresh rhubarb, cut into 1/2-inch chunks
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Topping:
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1/2 cup sugar
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1/2 cup chopped nuts
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1 teaspoon cinnamon
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1 tablespoon butter, melted