For the slow cooker, put in a roast or a bird, some root veggies like carrots, turnips, potatoes, a few spices. I like a little garlic, onion, salt and pepper. Put in a little water, turn it on and enjoy your day.
The meat will come out very tender, and all your veggies will be done.
Same goes for pasta sauce. Brown some ground beef. Put that in the pot with some finely chopped peppers, tomato paste, tomato sauce, spices to your taste. When you get back in the evening cook some pasta to go with it.