Two things I always have on-hand to make recipes easier: a jar of pesto (that way you have herbs in the fridge, that won't go bad so fast) and frozen, chopped onions (saves time and pain!).
Do you use a crock-pot? Stew is pretty easy to make, and really nice to have this time of year. Leftover can be made into a chicken pot pie. I just put some chicken breasts and some chicken broth in and let it cook on low for several hours, then I add frozen stew vegetables...my grocery store sells a bag with carrots, onions and potatoes. Some thyme makes it tastier.
To turn into pot pie: take the broth and thicken it as you would gravy (not too thick) with some flour or constarch, in a pot on medium heat. Then put it and the chicken/veggies into a pie dish. Cover with a pre-made pie crust, brush with a little milk (or smear it on with your hand!) then bake at 350 for about 25 minutes, until the insides are bubbling and the crust is golden-brown.
Quiche is really easy to make, and re-heats fast for a quick meal. (Have a big salad on the side).
Mix a 2-cup bag of cheddar (Cabot 1/2 Skim works really well) with 1/8 cup of flour.
In separate bowl, mix 4 eggs with 1 1/4 c milk (skim works fine). Add salt & pepper to taste.
Add 1/3 cup of chopped onions (frozen work fine) and some chopped brocooli (again, frozen works fine - one of the square boxes in the freezer section is the perfect size).
Stir it all together, pour into a pie dish lined with a store-bought pie crust. Cook at 350 for about 45 minutes. (Sometimes I pre-cook the pie crust a few minutes, which works best if you have pie-weights). The quiche is done when a knife goes in & out clean. Turn the oven off, and leave the quiche in on the bottom shelf for another 20 minutes or so, to finish get the crust nice & crisp on the bottom.