INGREDIENTS
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1 (8-ounce) package frozen 3-inch pastry shells, thawed
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3 tablespoons prepared mustard
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2 large eggs
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3/4 cup milk
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3 tablespoons minced onion
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1 cup (4 ounces) shredded Cheddar cheese (see Note)
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1/2 cup chopped cooked ham (see Note)
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1/2 teaspoon salt
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1/8 teaspoon black pepper