I try to eat mostly paleo so the America's Test Kitchen Paleo cook book is great. In fact, America's Test Kitchen anything is great.
It's not health related but you can certainly modify the recipes to be low-carb but I also really like 2 plates, 1 pot I haven't come across a recipe I didn't like in that book. I will say that I usually have a ton of leftovers from the side portions of the meals.
In maybe a less combative tone, cooking really isn’t that hard and you can make yourself really delicious meals for not meaningfully more time or money than required for smoothies.
I really like One Pan Two Plates , but Serious Eats and WaPo’s Voraciously blog also have a lot of series/posts on “stress free” meals. Voraciously actually just did a 12 part “how to use your kitchen” series that was really informative even as someone who has been working at being a better cook for a decade.
If all of those still seem too daunting, look up how to roast a chicken. It’s like 20 minutes of active cooking time and it’s easy to find a recipe that’s seasoned a way you like. Also, you get a ton of delicious leftovers!
The biggest benefit to all of this is that, if you ever go back out on the market, everyone is impressed by someone who can cook!
Good luck!
Here are some I have saved:
Really I just think about of what I'm craving and Google that thing cooked in the InstantPot, some recipes are good, some are bad. It's just a matter if figuring out which blogs and sites know what they're doing. Also I'll adapt Slow Cooker or Dutch oven recipes
I also suggest the following cook books for one pot cooking:
I love this one and use it all the time. http://www.amazon.com/One-Pan-Two-Plates-Weeknight/dp/1452106703/ref=sr_1_1?ie=UTF8&qid=1449342825&sr=8-1&keywords=One+pan+two+plates