"The sour tang and bready texture of the yeasted cake dough keep things interesting; heaps of streusel keep the crowds happy...."
INGREDIENTS
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6 tablespoons unsalted butter, melted, slightly cooled, plus more
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1 1/4-ounce envelope active dry yeast (about 2 1/4 teaspoons)
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2/3 cup (packed) light brown sugar, divided
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1 large egg, room temperature
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3 cups all-purpose flour, divided
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1/2 cup sour cream, room temperature
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2 teaspoons finely grated orange zest
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1/3 cup fresh orange juice
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2 teaspoons baking powder
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1 teaspoon kosher salt
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1/2 cup all-purpose flour
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1/2 cup old-fashioned oats
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1/3 cup (packed) light brown sugar
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2 tablespoons granulated sugar
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1 teaspoon ground cinnamon
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Kosher salt
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6 tablespoons unsalted butter, melted, slightly cooled
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2 pounds firm baking apples (about 4 large), halved, cored, very thinly sliced
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1 1/2 cups powdered sugar
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2 tablespoons (or more) fresh orange juice