Place the Monterey Jack cheese on one side of the bread. Add arugula leaves, onion, tomato, salt and pepper. Crumble goat cheese over top and then add Cheddar cheese. Top with second slice of bread and grill in a buttered skillet or a Panini press until the cheese has melted and the bread is lightly browned.
Recipe by Not Just Sunday Dinner at https://notjustsundaydinner.com/ultimate-tomato-soup-and-over-the-top-grilled-cheese-sandwich/