not quite the same as I am not working at the moment but my children do activities every evening between school and dinner so I find trying to cook a meal a bit of a problem.
Once the eldest started school we pushed dinner time back to 6pm primarily because hubby wasn't getting in from work until then so it meant we could still eat together but now they have started doing things it is much easier.
jacket potatoes on oven timer is always a good one - can just be done with cheese/tuna/chicken in white sauce from a tin/baked beans/salad etc.
we use frozen veg a lot because you can cook them so quickly.
things you can have cold - quiche, roast chicken (buy a whole cooked one then use it for packed lunches too), ham, cold sliced beef, smoked salmon, cook salmon the day before and put in the fridge - nice cold
I am lucky because I am able to put on casserole or stew during the afternoon but a slow cooker would solve that problem for you.
fish can often be cooked very quickly, you will also find thin cut/quick cook turkey steaks or beef steaks in supermarkets which are only between 5 and 10 minutes to cook I think so possible to do.
homemade soup if you can face cooking it in batches at the weekend, and mince as has been mentioned, that can go easily with pasta or rice (for ease of cooking supermarket frozen rice microwaves in under 4 minutes) or jacket potatoes.
pasta sauce can be made very quickly with just tinned tomatoes, chopped veg or cooked meat, a few herbs just on the hob for a few minutes.
it is difficult but it is doable and there isn't anything wrong with having non homecooked food some of the week IMO. You can only do what you can do. just try and make sure to do fruit for deserts and you will feel less guilty about having to do something not so healthy.