You just cook more. You plan for it. When you cook a meal you think how much you need to put then put 2x surely it will last 2x the time. Else adjust next time ti even more! The trick is it doesn’t take double the time cooking double the food.
You obviously haven't cooked for the scenario I presented. I'd need another stove/oven.
It depends of the meal but sometimes I use 2 big pans and a big pot to cook if its a lot. Its true a normal sized pan and pot would not work though.
