INGREDIENTS
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Streusel Topping:
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1/2 cup (65 grams) all purpose flour
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1/2 teaspoon ground cinnamon
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3 tablespoons (40 grams) cold unsalted butter, cut into pieces
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1/4 cup (70 grams) brown sugar
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1/4 cup (20 grams) toasted and coarsely chopped hazelnuts (can use walnuts or pecans)
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Cake Batter:
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1 cup (130 grams) all purpose flour
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1 teaspoon baking powder
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1/8 teaspoon salt
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1/4 cup (56 grams) (4 tablespoons) unsalted butter, room temperature
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1/2 cup (100 grams) granulated white sugar
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1 large egg
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1/2 teaspoon pure vanilla extract
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1/3 cup (80 ml) milk
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2 large Granny Smith Apples, peeled, cored, and cut into thin (1/8 inch) slices