Mix together the mustard powder, garlic granules and black pepper.
Sprinkle the mixture over both sides of the gammon steaks and set aside.
Place the milk, reduced fat spread, nutmeg and bayleaf in a small saucepan and heat over a low heat, until the spread has melted.
Mix the cornflour with the water and blend until smooth.
Bring the milk to the boil and pour in the cornflour mixture, whisking or stirring well. Cook for 4 - 5 minutes until thickened.
Season with black pepper to taste and stir in the parsley.
Spray a large frying pan with low calorie cooking spray and place over a medium heat.
Fry the gammon for 5 - 6 minutes, or according to packet instructions, turning once, until thoroughly cooked through.
Transfer the gammon steaks to serving plates and pour the sauce over.
Garnish with a sprig of parsley.