I'm fairly certain that quick, healthy, tasty midweek meals are the holy grail!
We eat a lot of pasta - in the 11 minutes it takes to cook the pasta, I can usually whip up a sauce. My favourites are:
Mess'o'pasta (usually chopped onions, mushrooms and chicken or bacon with a jar sauce pesto)
Cheesy bacon pasta - courgettes, bacon and onions fried up with creme fraiche and loads of grated cheese
Chorizo and herbs - chopped chorizo fried with garlic, then throw on handful of chives and parsley (I buy fresh, chop and keep in freezer) and Parmesan and stir through pasta
Chorizo and green beans pasta - diced chorizo, fried, add beans (or broccoli) to the end of the pasta cooking and then stir it all in with cream cheese
Also, I like grilled lamb (I often put some Harissa paste or ras-el-hanout on it) with couscous - once cooked I add seasoning, oilive oil and some dried fruit and pine nuts or flaked almonds - and salad.
As a pizza alternative, fry some lamb mince add chopped tomatoes and pine nuts, spread a naan or flatbread with houmous and top with the mince mix, stick under a grill for a little while, then seve with yoghurt dolloped on top and a cucumber and grated carrot salad.
Stir fries with stir in noodles always work well, too. I like to add peanut butter to make a satay.
For quick Mexican dishes (utterly inauthentic, I'm sure) I've used the fajita packet mix - add to mince beef when frying to then roll in tortillas with sweetcorn, tomatoes and cheese, or add to cooked chicken and a tin of tomatoes, then layer up with fajitas and cheese like a Mexican lasagne and stick in an over for 10 mins.
I've started sitting down one evening a week and planning meals and I find that thinking in advance about when I'm working late or on my own, I can often get two days' worth of meals from one cooking session by doing a bit more when I have time. I also struggled with batch cooking, because it doesn't seem to have enough of a point, but just doubling up on quantities to get leftovers, or cooking extra chicken one night so I don't have to spend time cooking it the next night, really helps me.
Hope that helps!