Preparation Steps

• Preheat oven to 400°F. Line a large baking sheet with parchment paper.
• Cut the puff pastry sheets into 5-inch squares and chill in the refrigerator.
• Melt butter over medium heat in a saucepan. Stir in flour and salt; cook for 1 minute.
• Gradually whisk in the milk and bring to a boil, whisking constantly.
• Reduce heat and simmer until thickened, stirring occasionally.
• Add fresh spinach and cook until wilted, about 1 minute.
• Stir in diced ham and 1 cup Swiss cheese. Remove from heat.
• Arrange puff pastry squares on prepared baking sheet.
• Top each square with a spoonful of the ham and cheese mixture and sprinkle remaining Swiss cheese on top.
• Fold corners of the dough squares to form smaller squares encasing the filling.
• Brush pastry with beaten egg white to glaze.
• Bake for 18-20 minutes or until puffed and golden brown.