On an evening when there is a bit more time to spare, it makes sense to cook a larger batch than needed for that single meal. The extra portions can be left to cool and then frozen, ready to be pulled out on a day when there simply isn't time to start from scratch. This small bit of forward planning turns one evening's effort into two or three ready meals later on.
Choosing the right dishes for this habit makes a real difference. Soups, stews and other dishes that keep their texture well after freezing are particularly suited to being made in bulk. Meals that would otherwise suffer from reheating, such as anything meant to be crisp, are better saved for cooking fresh on the day itself.
A freezer that works for you
Labelling each portion with a simple note of what it is and roughly when it was made helps enormously when the freezer starts to fill up. Without labels, it becomes far too easy to lose track of what is actually in there, and portions can end up forgotten at the back for months on end.
Portioning the food into single or family-sized containers before freezing also saves time later, since only what is needed has to be defrosted. Trying to break apart one large frozen block under time pressure is far less convenient than simply lifting out a ready portion.
Over time, this habit builds up a small reserve of ready meals that takes the pressure off busy evenings. Instead of reaching for something quick and less satisfying, there is already a proper, home-cooked meal waiting, made with far less effort than starting again from nothing.
This way of cooking also tends to reduce waste, since ingredients bought for one recipe get used up fully rather than being left to go off in the back of the fridge. What begins as a single evening of cooking ends up feeding the household several times over, with barely any extra effort involved.