Will your teen eat soup? (Tortilla-chicken soup, minestrone, avgolemono, or perhaps carrot-ginger?) If you have a decent bakery nearby you can get an interesting bread to go with it.
Quesadillas
Panini or Croque Madame/Monsieur
Chili (30 minutes on the stovetop; my kids only eat it with corn chips and sour cream
)
Satay (chicken or beef, with rice and stir-fried green beans)
Lasagne, Lasagna rolls, or eggplant rollatini
If you go to Costco, the rotisserie chickens are good and you could get two interesting meals out of just one.