INGREDIENTS
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8 tablespoons salted butter plus more for greasing casserole dish, softened
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About 1 1/2 pounds ripe, sweet nectarines, pitted and quartered
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1 cup plus 1 teaspoon sugar
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2 eggs
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1 1/3 cups mascarpone
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1/8 teaspoon almond or vanilla extract
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1/4 cup all-purpose flour