I rarely follow a recipe word-for-word (or rather ingredient-for-ingredient) anyway, but adapt it to use ingredients that I already have and need to use.
Recipes are often very imprecise anyway, asking for things like one medium carrot or half an onion, where no weight is given and different people's interpretations of those sizes will very hugely.
To be honest, I am another of those who nowadays will almost always make a big batch of something anyway in order to have enough for two or three meals, either from the fridge or the freezer, and very very rarely find things any less pleasant to eat after they have been reheated.
Forty years ago, I did have a little book from Sainsbury's called, I think, Cooking for Two, but we found the portion sizes too small for our northern appetites 