Egg In A Hole Cheese Toastie

Name: Egg in a Hole Cheese Toastie
Yield: 0
Ingredients: 2 slices of sourdough; Softened butter, for spreading; 30 grams cheddar, grated; 30 grams double gloucester, grated; 50 grams mozzarella, sliced; 1-2 slices of good quality ham; 1 tablespoon dijon mustard