I've had several people tell me that the Whole Health Source post that changed their lives the most was one I published in 2012-- about a pressure cooker.
In 2012, I first reviewed the Instant Pot-- a "pressure cooker for the 21st century" that also doubles as a slow cooker and rice cooker (1). Since then, we've used it more than 400 times, and it has saved us countless hours of kitchen drudgery. It's indispensable for my current cooking style, and a major time saver for anyone who leads a busy life but still wants to cook wholesome food at home. It's extremely satisfying to be able to put your ingredients into the Instant Pot, push a couple of buttons, do something else until it beeps, and then eat a healthy, inexpensive, and delicious meal.
Pressure cookers are one of the most time- and energy-efficient cooking tools, but electronic versions are even more efficient than traditional stovetop pressure cookers. They're more time-efficient because you don't have to fiddle with them-- for example, adjusting the heat. They're more energy-efficient because 1) they stop heating when the interior has reached the appropriate pressure, meaning that they're only using energy for part of the cooking process and they hardly vent any energy-wasting steam, and 2) they're insulated well enough that the sides never get hot.
I've used my Instant Pot for a wide variety of cooking tasks, and this is what it does best: