If you want to save money as well as time in the kitchen, try consolidating your efforts by cooking large batches of food and freezing what you don't use right away. A large pot of spaghetti or chili will take about the same amount of time to make as a small one, but cooking a larger batch could yield double the number of meals.
Another advantage to cooking in bulk is that you can eliminate some waste. If you've ever let half a head of celery slowly disintegrate in the vegetable crisper because you didn't know what to do with it, you've got the idea. One afternoon or evening is all you need to make enough food for a week's worth of meals or more. After that, just defrost, microwave and eat your creations in peace.