The first hack is practice. (I'm going to go out on a limb and guess that you aren't very experienced; otherwise, you would have told us how experienced you are.) In this way, cooking is like programming. As with a programming task, a recipe that takes an hour of attention now may take half an hour of your attention next year, and there's no way to enumerate the difference as a handful of tips and tricks. The biggest…
Rice and lentils can be stored dry for months, and lentils (unlike other beans) can be cooked without soaking them first. If you always have rice and lentils on hand, you're always halfway to a decent meal. Cook the rice and lentils however you like; there are a million ways to do it. You can even just cook the rice and lentils together in a pot and rely on the roasted vegetables to provide all the flavor.
Roasting vegetables is extremely fun and satisfying for two reasons:
1) It's by far the simplest and laziest way to prepare vegetables. Roasting makes stir-frying look like railroad chain gang work.
2) You can roast damn near anything. Potatoes, carrots, onions, cauliflower, broccoli, asparagus, garlic, Brussels sprouts, fennel, endives....
Here's a short (2:25) video telling you absolutely everything you need to know to start roasting vegetables:
http://www.chow.com/videos/show/all/12072/how-to-roast-veget...
You can get fancier than that, but you might never want to.