Mix together the ingredients for the meatloaf in a large bowl.
Shape into a loaf.
Peel and quarter potatoes.
Place the quartered potatoes in the bottom of you Instant Pot as evenly as possible.
Pour chicken broth over the top.
Place rack that comes with the Instant Pot, over the top of that, keeping it as flat as possible.
Put 2 pieces of aluminum foil over the top of that to make a make-shift bowl out of the foil for the meatloaf to sit in.
Set the meatloaf in the foil, on top of the rack.
Pour BBQ sauce over the top of the meat loaf.
Replace lid and shut steam valve.
Cook the meatloaf and potatoes in the Instant Pot on Manual mode for 25 minutes.
Quick release the steam.
Lift the meat loaf out of the Instant Pot or pressure cooker.
Add the remaining ingredients for the mashed potatoes to the pot and mash the potatoes well.
Serve sliced meatloaf with mashed potatoes.
Optional: broil meatloaf for a couple minutes to make the ends more crispy.