INGREDIENTS
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2 cups old-fashioned rolled oats (not instant)
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3/4 cup light brown sugar
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1 cup walnuts or pecans, divided
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1/2 cup raisins
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1 teaspoon baking powder
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2 teaspoons cinnamon
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1/2 teaspoon salt
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2 large eggs
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2 cups milk
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1 teaspoon vanilla extract
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4 tablespoons unsalted butter, melted, plus more for greasing the dish
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2 tart yet sweet baking apples, such as Honey Crisp, peeled and cut into 1/2-inch chunks (about 2 cups)