Peel, rinse, and pat dry the potatoes.
Cut potatoes in half lengthwise, then quarter each half evenly so you have eight cubes per potato.*
Add olive oil to a very well-seasoned cast iron skillet over medium heat.*
Once the pan is very hot, add your potatoes in a single layer. Cover with a lid, set a timer for 10 minutes, and walk away.
When the timer's up, remove the lid. Carefully flip the potatoes over. Set the timer for 5 minutes and walk away again (you don't need the lid anymore).
When the timer's up, add your chopped onions and let them chill out. Set a timer for 5 minutes again! Go have a sip of coffee or something.
Once the timer is up this time, stir the potatoes and onions with a wooden spoon and continue to cook for 5-10 minutes until the potatoes are cooked through and the onions have softened.
In the last few minutes of cooking, add your seasoning!