To prepare a Ultimate Grilled Cheese recipe, first you need to prepare your ingredients. First, you will need your bread. You can use any bread you like, but if you want to make your own grilled cheese, then you'll need some bread that has been pre-made. Then, preheat your oven to 450 degrees F (232 degrees C) and grease your baking sheet with non-stick cooking spray. Place the bread in the oven and cook for about 10 minutes, or until the cheese is melted and the crust is golden brown.