Step 1: get a pyrex baking dish or similar and add one layer of nachos to cover the bottom of it. pour on some salsa and top with grated mozzarella. repeat this untill you like have a stack of nachos, salsa and cheese(you could potentially add chillies ect between the layers). make sure the last layer you have is of mozzarella. bake in a moderate oven for about 10 mins till cheese has melted. for a nice topping put under the grill for a bit to help the cheese melt. serve with anything or with sour creme dip.