Ham and Cheese Pastry with Spinach - Recipes by Clare

Ingredients

• 2 sheets frozen puff pastry, thawed according to package directions
• 2 tablespoons unsalted butter
• 2 tablespoons all-purpose flour
• ¼ teaspoon kosher salt
• 1 cup whole milk, room temperature
• ¼ teaspoon pepper
• 2 cups cooked ham, diced
• 2 cups fresh spinach
• 1 ½ cups Swiss cheese, grated and divided
• 1 large egg white, lightly beaten