INGREDIENTS
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3 tablespoons oil
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1 large onion, diced (about 2 1/2 cups)
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2 (9-inch) refrigerated, unbaked pie crusts (a 15-ounce package)
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3/4 pound smoked ham, diced
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1 (10-ounce) package frozen chopped spinach, thawed and drained
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1 1/2 cups freshly grated Parmesan
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1 cup ricotta cheese
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4 eggs, plus 1 yolk, slightly beaten
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1/4 teaspoon kosher salt
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1/4 teaspoon freshly cracked pepper
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1 egg white, lightly beaten