How old are the others and what cooking equipment do you have?
I would be inclined to go for small potatoes,easily chopped veg (courgettes and peppers), ready peeled garlic, etc, all dumped in a tray with chicken thighs, cherry tomatoes, whatever else you have. Drizzle of oil and a scatter of salt and roast.
don’t carry the heavy hot tray single handed - pull the oven rack out slightly so you can serve directly from the tray with a ladle or fish slice with each eater holding a plate up for you.
fresh stuffed pasta, drain, serve with butter and ready grated cheese, and a bag of ready made salad.
rice - microwave packet particularly easy. Salmon steaks. Green beans. And sauce.
If you have a slow cooker then a packet of frozen casserole veg, a pack of diced meat of choice, stock, tinned tomatoes, herbs. And potatoes in the oven.
jacket potatoes and get everyone to sort their own toppings - baked beans, grated cheese, tuna mayo, sweetcorn, lettuce, whatever else works for you.
If you like stir fry then easiest way to go it one handed is to use packet of stir fry veg, packet of sauce, ready cooked prawns and a handful of cashew nuts, with noodles or rice whichever you prefer.