Our recent favorite is quite similar to StellaLuna's, but my SO is in love with it, so I thought I'd share.
4 slices of 7-Grain Light bread
4 slices Boar's Head Ovengold Turkey
1 Tomato, diced
1 green onion, sliced thin
4 slices Sargento Chipotle Cheddar cheese
leaf spinach
garlic powder
sriracha sauce
black pepper
I lay the four pieces of bread on a Reynolds Wrapper foil sheet. Dice the tomato, slice the onion, combine in a bowl with garlic powder, pepper and sriracha to taste. Lay enough pieces of spinach on the bread to just cover the bread in a single layer. Place a slice of turkey on each, spoon tomato/onion/spice mixture onto the top, also in a single layer (I save the rest for another sandwich another time... it lasts around 3 days in the fridge). Transfer the foil with the bread slices directly onto a cookie sheet. Place a slice of the cheese on top of each. Place in COLD oven, middle rack, and turn on the broiler to 500F. It usually takes less than 5 minutes for the bread to toast and cheese to melt.
It's awesome because the spinach just barely steams, the tomatoes and onions get rid of the raw taste and the bread is toasted. The cheese seals in all the good flavor. Sometimes I dip it in yellow mustard, which my SO thinks is disgusting. He uses a Peruvian Sauce you can only get in North Florida for now. And, I serve it with mini dill pickles. Cause I'm weird like that. Quick, easy, after-workout meal.