Basically a variation of the popular sandwich option, we do quesadillas- drop a tortilla on a skillet and melt some cheese on it, then fold it over or top with another tortilla and flip to heat the other side through- works for both corn and flour tortillas, but a stack of corn tortillas will keep in the fridge forever and takes up very little space, so it's a staple at our house. If you're fancy, add some hot sauce or chipotle sauce, or throw in whatever fillings you can find in the fridge- great way to use up the last little bits of previous meals. My son does a pizza version with mozzarella cheese and pepperoni. I like to add a schmear of tomato paste or sauce to that version- if there's an open jar in the fridge.
Another quick meal is to whip an egg and go to make an omelet, but when it's still a bit gooey lay a flour tortilla over it rather than fold it over. Then lift it out and generously butter the pan and flip the egg-tortilla so it's tortilla side down and fry/toast the tortilla. then roll the whole thing up and devour. Serve with a handful of whatever leafy green is closest to becoming compost.
I also like to keep a head of cabbage in the back of the fridge so there's always some veg on-hand- shredded cabbage sautéed in salted butter topped with a fried egg is immensely satisfying.