The reason people order food on a tired evening is rarely the cooking. It is the pile of pans waiting afterwards. A tray in the oven or a single wide pan removes that objection entirely, and it happens to be the easiest way to cook whatever is already in the fridge.
The shape of a tray dinner
Pick one thing with protein, one or two vegetables, one starch if you want it, oil, salt and one loud flavour. Chicken thighs, potatoes, a red onion, olive oil, salt, a lemon. Sausages, peppers, chickpeas, paprika. Halloumi, courgette, tomatoes, oregano. The combination barely matters. What matters is that everything is cut to a size that finishes at the same time.
The timing rule
Cut hard things small and soft things large. A potato in two-centimetre cubes and a courgette in thick chunks will finish together; the same potato in halves and the courgette in coins will not. If something genuinely cannot keep up — rice, a whole aubergine, thick root vegetables — give it a head start of fifteen or twenty minutes alone, then add the rest. That is still one tray.
Do not crowd the tray
This is the single most common mistake. Food packed together steams in its own moisture and comes out pale and limp. Food in a single layer with gaps roasts, browns and tastes of something. If it does not fit, use two trays or cook it in two goes. Two trays still beat four pans, and the difference in the result is not subtle.
Finish it off the heat
A tray bake comes out of the oven tasting roasted but flat. It wants something fresh and sharp added at the end: lemon, vinegar, yoghurt, raw herbs, a spoon of pickle. Add it after the tray is out, not before. Anything delicate you put in the oven early is wasted by the time it comes out.
Line it and you are done
Baking paper turns the washing up into folding the paper in half and throwing it away. The tray itself stays clean and the pan you did not use stays in the cupboard. That is the whole appeal: on the nights you least want to cook, this is still faster than deciding what to order.
One tray, everything cut to finish together, nothing crowded, something sharp at the end. It is the most forgiving way to cook, and it leaves nothing behind but a sheet of paper.