Croque Madame - French-style toasted ham and cheese topped with a fried egg

INGREDIENTS

• 4 eggs
• 1/2 cup grated parmesan (or tasty cheese)
• 8 slices ham
• 2 tablespoons plain flour
• 1 teaspoon dijon mustard
• 1 tablespoon butter
• 1 1/4 cup milk
• salt and pepper to taste
• 1 cup grated cheese (I use gruyere)
• 1 tablespoon butter, softened
• 1/4 teaspoon ground nutmeg
• 3 tablespoons butter
• 8 slices white bread