A good grilled cheese sandwich is the ultimate comfort food. I mean…bread…butter…CHEESE! What could be better? My “Three Cheese Grilled Cheese with Caramelized Onions”, that’s what. Dee’s Three Cheese Grilled Cheese with Caramelized Onions A regular, three-ingredient grilled cheese sandwich is perfectly adequate for a simple lunch. Bread, cheese, butter. Simple and delicious. However, if…