"(TESTED & PERFECTED RECIPE) A super-generous crumb topping and genius pastry chef trick make this the best crumb cake ever...."
INGREDIENTS
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2-1/2 sticks (10 ounces) unsalted butter, melted
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1/2 cup granulated sugar
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1-1/2 cups (packed) light brown sugar
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2 teaspoons ground cinnamon
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1/2 teaspoon salt
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4 cups cake flour, spooned into measuring cup and leveled-off
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Confectioners' sugar (for dusting)
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2 cups all-purpose flour, spooned into measuring cup and leveled-off
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1 teaspoon baking soda
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1 teaspoon baking powder
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1/4 teaspoon salt
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1 stick (4 ounces) unsalted butter, softened
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1 cup granulated sugar
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3 large eggs
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1 teaspoon vanilla extract
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1 cup sour cream