"An easy recipe for crumb coffee cake...."
INGREDIENTS
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1 Tablespoon flour, for coating the pan
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2 cups all-purpose flour (measured correctly)
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1 cup + 2 Tablespoons granulated sugar
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1 teaspoon salt
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10 Tablespoons (1 and 1/4 stick) unsalted butter, firm and cold
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1 teaspoon baking powder
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1/2 teaspoon baking soda
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3/4 cup buttermilk, at room temperature1
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1 large egg, at room temperature2
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2 teaspoons vanilla extract
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2/3 cup packed light or dark brown sugar
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2 teaspoons ground cinnamon