Heat your cast iron skillet over medium high heat. Melt a big pat of butter while its heating up. Swirl the butter in the pan to coat it evenly. Use an oven mitt so you don’t burn your hand on the skillet handle. Have a heavy plate, lid or a fry pan ready so you can place it over your grilled cheese as it cooks.
Coat each piece of bread with a thin layer of mayonnaise. Top each slice with cheese & then make a sandwich. Place the sandwich in the hot pan. Let the first side cook until golden brown. Flip & do the same to the other side.
Add more butter to the pan & swirl it around. Flip sandwich again. Now you need to watch things carefully, it’s easy to burn your sandwich. Place the lid or another pan over the top of your sandwich & watch the cheese start to melt. Flip a number of times, covering & watching the bread carefully, adding more butter as grilled cheese absorbs it.
Remove from pan when the bread is crispy & browned and the cheese is completely melted. Serve immediately.
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