When I don't have the energy to cook a side dish of vegetables or prep an elaborate salad, I throw a bed of greens on whatever I'm eating. It doesn't matter if it's pizza, pasta, or curry, a handful of peppery arugula always seems to make the dish better.
If you aren't a huge fan of leafy greens, keep your favorite vegetables stocked in the freezer. Frozen veggies work well in pasta sauces, soups, and stews — all you need to do is toss them in the dish while cooking! On days when you can only muster microwaving a frozen entree, add some extra veggies in before nuking the meal.
Source: Flickr user trec_lit