I absolutely love eggs. Not only are they cheap, they're supremely tasty, and incredibly quick to cook. Some people seem to struggle with associations that they're a breakfast food only - but more often than not, I eat them for dinner after a long day at work, when I'm starving and desperate to have something nutritious for dinner.
Here's two egg-based recipes that I've made recently. Neither of them took longer than 15 minutes to make (from start to finish), although I have to confess and say that for the second recipe, I did already have roasted squash in the fridge.
Baked egg souffle-type dish. Recipe here (scroll down the page a bit!). I added smoked salmon underneath the egg too.
Nigel Slater's spiced squash and fried egg. As you can probably tell, the picture is not mine! Recipe here. I roasted the squash in advance though and then just reheated in a frying pan with the spices.
The second recipe as well has the benefit of being suitable for the 5:2 diet - use low-cal spray to fry the butternut squash, and add a couple of sprays when roasting too. (or steam as per the recipe and no need for oil). You could serve with a green salad on the side or some steamed broccoli if you're still hungry.