When I was married I cooked just as much as my Ex usually for us and her son but from time to time when my kids would visit I'd be the one to cook for the entire fam so I was more than use to cooking for a handful of folks. Now that I'm a bachelor I'm usually cooking for myself and ever so otfen a guest so getting adjusted to not making so much food was a little cumbersome at first.  My meals now are generally enough for me to eat leftovers the following day cause you never know who may drop by wanting to sample something. So check out what's on the menu this month for dinner and remember that less sometimes is more.  

Note: I purposely did not include measurements because I cook from my heart, and decide spur of the moment how much needs to go into whatever it is I'm cooking, so I think you should try to do the same. Good luck!