"A big sheet cake that starts its life as a boxed cake mix gets a topping made of tons of buttery, crumbly streusel...."
INGREDIENTS
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1 (18.25 ounce) package yellow cake mix
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2/3 cup water
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3 eggs
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1/2 cup butter, softened
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1 1/3 cups packed brown sugar
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1 tablespoon ground cinnamon, or to taste
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1 tablespoon vanilla extract
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1 1/2 cups butter
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4 1/2 cups all-purpose flour
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1 tablespoon confectioners' sugar for dusting (optional)
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