"A savory slab pie made with flaky puff pastry, ham, Swiss cheese, and caramelized onions. Serve it for a casual lunch, brunch, or an appetizer...."
INGREDIENTS
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2 sheets puff pastry (, defrosted and rolled into 10-inch squares)
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1 tablespoon Dijon mustard
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6 ounces shredded swiss cheese ((I use Emmental or Gruyère))
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4 ounces thinly-sliced ham ((I use Black Forest))
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1/4 cup caramelized onions (, chopped (about 1/2 large onion))
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1 teaspoon chopped thyme leaves
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1 large egg
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1 tablespoon milk
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1/4 teaspoon garlic powder
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1 tablespoon chopped fresh parsley