Ham & Cheese Christmas Tree Pastry (Flaky Holiday Appetizer) - My Home Made Recipe

Ingredients

• 2 sheets frozen puff pastry, about 11 oz (320 g) each, thawed but cold
• 1 tablespoon Dijon mustard
• 8 oz (225 g) thin sliced deli ham
• 1 1/2 cups (150 g) finely grated sharp cheddar, Gruyere, or Swiss cheese
• 1 large egg, beaten
• 2 tablespoons finely grated Parmesan, for finishing
• 1 tablespoon chopped fresh parsley, optional
• 1 tablespoon (14 g) unsalted butter
• 1 tablespoon all-purpose flour
• 1 cup (240 ml) whole milk, warm
• 1/2 cup (60 g) grated Gruyere or Swiss cheese
• 1 pinch ground nutmeg
• Salt and white pepper, to taste