The original title of this post was "Spinach: I put that shit in everything". But that's not really a tip. I'm not trying to be one of those sneaky moms and feeding my family brownies that are secretly full of green beans. I just literally find a way to put a handful of spinach into every meal - its a really simple way to get some extra nutrition each day.
Mostly I throw some finely chopped spinach into our stir fries, pasta sauces, or soups. By chance I found a way to have finely chopped spinach on hand all the time without chopping my life away: freeze it.
Yup - freezing fresh spinach makes it incredibly brittle and then you can simple crush it with your hands and sprinkle it into whatever you're cooking. I literally just throw the whole bag of spinach into the freezer until I need it, then take out and crush what I need as I need it.