Be kind to yourself, you're doing your best. The main thing is that you guys are fed. I can't imagine how you must have got through these past months. To then start back at FT work is a huge shock to the system too xx
If you're going to venture back into home cooking, then start small. I'd second trying to buy the family sized pre-made meals from M+S or Sainsbury's: lasagne, cottage pie etc. You can also buy pre-prepped veggie sides to make things easier. Do a pizza night (buy frozen pizza from store and just cook at home), pasta night (pre-made from store, or fresh pasta and pre-made sauce), Indian night etc). Keep things simple: jacket potato and beans/tuna mayo/chilli con carne/cheese. Sausages with mash and gravy and veg. Omelette or scrambled egg on toast. Fish fingers, chips, veg.
When you do venture back into cooking from scratch, what kitchen gadgets do you have? Do you have a large slow cooker/Instant Pot? Or one of those Ninja Foodie type things that acts as an airfryer, slow cooker, pressure cooker etc? IF you do, bung all the stuff in there to make a slow cooked meal for one night (maybe at weekend), but double up the recipe to make extra portions, and then freeze what you don't eat. I do that a lot (it means I'm cooking food for that evening but also have a meal for later in the freezer). Often, we use the leftovers for taking to work/school the next day. My mum taught me to cook very well but the kitchen gadgets I have save me a lot of time when I'm doing a lot of cooking (when my folks died, I used a little bit of the money they left me to invest in a Thermomix and a Ninja Foodie and couple of robovacs to make my life a bit easier). The airfryer is fab because my kids (now that they're older) know how to use it to make things. I've got a recipe for risotto that is done in about 7minutes (cooking time) using the pressure cooker function).
I'm a single parent of two and work FT....but my youngest is 10 now, and my FT hours are condensed into 4 days, so I have a day off in the week to cook up a load of stuff (and try and make my house look less like a bomb site). Even then, I still will get days where I'm too knackered to do anything and buy in a take out (like last night! I could have used the bloody burgers in my fridge and bought in rolls/prepped some wedges. I didn't, I got them as bloody takeout). xx