Secure the lid in place and close the valve on your Instant Pot. Select Manual or Pressure Cook, and set to cook for 30 minutes.
When your meatloaf is done (a meat thermometer is definitely something I recommend to make sure the meat has come to temp and is fully cooked), just allow the Instant Pot to do a natural release.
Then once you've carefully removed the meatloaf and trivet from the Instant Pot, you can mash the potatoes right in the pot. Just drain the water off the potatoes, and place the Instant Pot on “Keep Warm.”
And that's it! All you need is a good vegetable to serve with your main course.
*I've used both old-fashioned oats and quick oats for this meatloaf. I've even used gluten-free quick oats more recently, so if you want a gluten-free meatloaf, this is the way to go (although you should also check ingredient labels on your other ingredients, especially seasonings, just to be safe).**You can use whole milk if you don't have heavy whipping cream.WHAT IS THE BEST GROUND BEEF FOR MEATLOAF?We prefer to use 90/10 ground beef when we're mixing up a meatloaf. In fact, we use 90/10 for pretty much everything. Our reasons are that it's leaner, there's less fat, and there will be less grease around your meatloaf.Don't worry about flavor… You'll still get really good flavor from a leaner ground beef. And you'll also be eating a bit healthier, as well.Note: You can use ground turkey for this recipe in place of ground beef. However, it will change the look, texture, and flavor of your finished meatloaf.SHOULD I COVER MY MEATLOAF WHILE COOKING?While you can cover the meatloaf with aluminum foil, it's really not necessary. In fact, that might take away from the flavors you'll get by cooking everything in one pot.HANDY TIP FOR REMOVING THE MEATLOAF FROM THE INSTANT POTOne question that comes up is whether or not you can use aluminum foil in the Instant Pot. While there's no need to cover your meatloaf, you can use foil to create a sort of sling or lifter for your pan.Just tear off a large piece of foil that will fit all the way around your pan, along with maybe 6 to 8 extra inches. Then fold the foil into a long strip (maybe 3-4 inches wide), and place that strip under the pan, bringing the excess strip up over each side of the pan to act as lifting handles.This way it's easy to remove the hot pan from the pressure cooker once your meatloaf is cooked and ready to serve.