"These moist and flavorful coffee cake muffins can be enjoyed any day of the week...."
INGREDIENTS
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1/2 cup (1 stick) unsalted butter, room temperature, plus more for pans
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1 3/4 cups all-purpose flour (spooned and leveled), plus more for pans
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2 teaspoons baking powder
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1 teaspoon baking soda
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1 cup sour cream
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1 cup granulated sugar
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1 teaspoon pure vanilla extract
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2 large eggs
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Confectioners' sugar (optional)
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1 cup packed dark-brown sugar
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1 cup all-purpose flour, (spooned and leveled)
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1/2 teaspoon salt
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1/2 teaspoon ground cinnamon
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1/2 cup (1 stick) chilled unsalted butter, cut into small pieces