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For the Streusel Topping:
- ⅓ cup all-purpose flour
- ⅓ cup packed brown sugar
- ½ teaspoon ground cinnamon
- ¼ cup cold unsalted butter, cut into small cubes
For the Cream Cheese Swirl:
- 4 oz cream cheese, softened
- ¼ cup granulated sugar
- 1 large egg yolk
- ½ teaspoon vanilla extract
For the Loaf Batter:
- 1½ cups all-purpose flour
- 1½ teaspoons baking powder
- ½ teaspoon salt
- ½ cup unsalted butter, softened
- ¾ cup granulated sugar
- 2 large eggs, room temperature
- 1½ teaspoons vanilla extract
- ½ cup sour cream or plain Greek yogurt (room temperature)
- 1½ cups fresh or frozen blueberries (if frozen, do not thaw)
- 1 tablespoon flour (for tossing with blueberries)
