Combine all the ingredients (except the avocado oil) in a sealable bag and toss to combine.
Use a vacuum sealer (or water displacement method described in the post above) to remove all the air from the bag.
Place the potatoes in the water bath and cook for 1 hour.
Remove from the water bath and place in an ice bath, if you're not planning to use them right away.
If you plan to use them immediately, set the bag aside.
Heat a cast iron or other skillet over high heat and add the avocado oil.
Add the potatoes and fry for about 60 seconds per side, tossing to brown all the sides and ensuring they don't burn.
Remove and serve sprinkled lightly with flaky sea salt and extra butter if desired.
Notes
Removing the air from the bag is an important step that should not be skipped to avoid bacteria entering the bag.
If the bag fills with air before the potatoes are cooked, just cut the bag open and reseal it with the vacuum sealer.
Always make sure the bag is completely submerged in the water to ensure the potatoes cook evenly. I LOVE these sous vide magnets for keeping food submerged - they work amazing!
To ensure even cooking, organize the potatoes in the sealable bag in a single layer (as much as possible) and make sure the potatoes are cut roughly into the same size pieces.
Mini potatoes sometimes come pre-washed (which is a great time saver). If you’re not using pre-washed, just make sure you scrub them clean.
If you prefer, you can skip the step of browning the potatoes and serve them directly from the bag. They will still be flavorful but they won’t have crispy exterior.
They can be crisped in the air fryer as well: 400°F for 10-15 minutes, or roasted in the oven at 450° for 10-15 minutes.