Not sure when I downloaded the Food Network app but here goes:
Francisco sourdough bread buttered grill side down w/ Tillamook medium cheddar & Swiss cheese low & slow. (YES to add-ons like avocado etc but not necessary)
As soon as we start going the mayo route I'm calling it cheesy bread:
Grated Jarlsberg, Romano, shit ton of mayo, cayenne pepper, a little lemon & lime juice + some parsley baked on a sourdough bread w/ hot marinara for dipping.