INGREDIENTS
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For the crumb topping:
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1½ cups all-purpose flour
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¾ cup light brown sugar
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⅓ cup granulated sugar
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¼ teaspoon salt
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1 teaspoon cinnamon
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¼ teaspoon freshly grated nutmeg
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1½ sticks unsalted butter, chilled and diced
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For the doughnuts:
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2½ cups all-purpose flour
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2 teaspoon baking powder
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1 teaspoon baking soda
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1 teaspoon salt
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½ cup (1 stick) unsalted butter, softened
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1 cup granulated sugar
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2 large eggs
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1 cup buttermilk
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2 teaspoons vanilla extract
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1 pint fresh blueberries
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For the glaze;
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2 cups powdered sugar
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3 to 6 tablespoons milk