• prep: 45 min
• cook: 0 hr
• total: 45 min

servings:

We doubt you'll have any leftovers from this homey blueberry cake crowned by a buttery, brown-sugar-sweetened streusel topping, but if you do, it will make a fabulous companion to your morning coffee.

• 1 cup all-purpose flour
• 1 tablespoon plus 1 teaspoon packed dark brown sugar
• 1 tablespoon plus 1 teaspoon granulated sugar
• 3/4 teaspoon cinnamon
• 1/2 stick cold unsalted butter, cut into 1/2-inch pieces
• 1 teaspoon baking powder
• 1/4 teaspoon baking soda
• 1/2 teaspoon salt
• 1/2 cup sour cream
• 3/4 teaspoon pure vanilla extract
• 1/2 stick unsalted butter, softened
• 3/4 cup granulated sugar
• 1 large egg
• 1/2 pound blueberries (3 1/4 cups)
• Accompaniment: sweetened whipped cream

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