I make extra of almost everything for the same reasons others have mentioned. I also chop and cook ahead, especially bell pepper and onion. I use these to make omlettes I really like to add LF Pepper Jack and top w/ Salsa and dollop of FF Sour Cream. It's breakfast for dinner but it's quick and easy.
I also freeze raw sliced ckicken breast and pounded top round steak in flat packets. They thaw in no time and I mix the ckick w/ bell pepper onion and mushrooms, add some Fajita seasoning (my brand has a few OP ingredients but you could make your own). I mix the steak w/ bell pepper, onions, and mushrooms top w/ some LF mozzarrella for faux Philly Cheese Steak.
Hope these help