• Heat the oven to 400°F. Beat the egg and water in a small bowl with a fork.
• Pound the chicken to 1/4-inch thickness. Cut each chicken breast in half. Coat the chicken with the flour.
• Heat the oil in a 12-inch skillet over medium-high heat. Add the chicken and cook until well browned on both sides. Remove the chicken to a plate. Cover the plate and refrigerate for 15 minutes.
• Stir the spinach and nutmeg in the skillet. Reduce the heat to medium. Cook for 5 minutes or until the mixture is hot, stirring often.
• Unfold 1 pastry sheet on a lightly floured surface. Roll the pastry sheet into a 14-inch square. Cut the pastry sheet into 4 (7-inch) squares. Repeat with the remaining pastry sheet, making 8 squares in all. Brush the edges of the pastry squares with the egg mixture.
• Place 1 chicken piece in the center of each of 4 pastry squares. Spread each with 1 teaspoon mustard and top with about 1/4 cup spinach mixture. Top each with another pastry square. Press the edges to seal. Brush the pastries with the egg mixture. Place the pastries onto a baking sheet.
• Bake for 25 minutes or until the pastries are golden brown.
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