INGREDIENTS
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Vegetable cooking spray
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1 medium Granny Smith apple, peeled, cored, and quartered
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1 cup sugar
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2 cups all-purpose flour
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2 teaspoons baking soda
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1/2 teaspoon plus 2 pinches salt
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1/2 teaspoon ground cinnamon
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1/4 cup chopped walnuts, toasted (omit if serving to children under 3)
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2 large eggs
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1 cup buttermilk, room temperature
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1/2 cup (1 stick) unsalted butter, melted