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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◾2 cups powdered sugar
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◾3 to 6 tablespoons milk