Gołąbki stew -- instead of faffing about, burning your fingers, making cabbage rolls, throw in (1) roughly chopped carrots, onions, celery and savoy cabbage; (2) some kind of pork mince or chunks of sausage (I have lately taken to wild boar and apple for this purpose); and (3) a tarragony tomato sauce (or season the sauce as you see fit). I adore gołąbki but also have an inherent dislike for anything that requires more than one pan. This can all go in the slow-cooker and boom. Also, we did the leftovers with a fried egg on top at the weekend, and it was maaaagic.
Any kind of chicken-rice casserole in the slow-cooker or a Dutch oven. We get a weekly veg bag from a field-to-fork farm co-op, and sometimes have 'straggler veg'. Extra carrots, a bit of greens, whatever's kicking about goes in with chopped chicken thighs, whatever seasonings I fancy, maybe a bit of white wine to help free up the starches in the rice (I go for an arborio or carnaroli, for heft). Buncha chicken stock (I make my own basically weekly because I'm a soup fiend), couple hours in the oven, and boom.
Speaking of soup, that's another good option for batch-cooking.
By the way, I have a really nasty soya allergy that we only figured out 18 months ago, and although I miss a lot of stuff (I actually love tofu unreservedly), one thing that has sort of saved my life is Maggi Liquid Seasoning. It tastes just about like I remember soya sauce tasting, is totally soy-free in the UK (recipe varies by country, apparently), and works great in stir-fries, soups/stews/sauces, and even as a sushi dipper. I've road-tested it on Mr Seahorse, and he agrees, so it's not just my fading memory of what soya sauce tastes like.