Instant Pot. Can be used as a rice cooker, slow cooker, pressure cooker (mostly known for this last use) Though probably not as good for rice specifically as an actual high-end rice cooker, it greatly increased the range of foods I eat. Makes it easy to make nice one pot meals overnight for multiple days, you can make really good broth soups from chickens etc quickly, or slowly if you prefer. If you like to try tough…
Dump in a gallon of milk, heat it up, let it cool, add a couple spoons of a store bought plain yoghurt (if you don't have some started saved from the last batch), put the lid back on and hit the yoghurt button and come back in like 8-10 hours. If you prefer a thicker yoghurt, strain it a bit before storing.
Gallon of yoghurt for the price of a gallon of milk and probably like 20 minutes of active work.