"I guarantee it's even better than your Grandma's...."
INGREDIENTS
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1 1/2 cups cake flour
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2/3 cup packed dark brown sugar
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2/3 cup granulated sugar
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1 1/2 teaspoons ground cinnamon
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1/4 teaspoon kosher salt
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8 tablespoons (1 stick) unsalted butter, melted and cooled
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Cooking spray
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1 1/2 cups sour cream, at room temperature
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1/4 cup whole milk, at room temperature
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3 large eggs, at room temperature
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2 large egg yolks, at room temperature
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12 tablespoons (1 1/2 sticks) unsalted butter, melted and cooled
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3 cups cake flour
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1 1/2 cups granulated sugar
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1 1/2 teaspoons baking soda
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1 1/2 teaspoons baking powder
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1 tablespoon vanilla extract
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3/4 teaspoon kosher salt
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Powdered sugar, for dusting (optional)