Combine ground beef, sausage, milk, onion salt and breadcrumbs in a bowl until mixed throughly -divide in half and shape into 2 loaves

Layer potatoes on the bottom of the Instant Pot and pour water or chicken broth over

Put Instant Pot rack on top of potatoes

Make foil bowl for the meat loaves and place on the rack in the Instant Pot, place both loaves in your foil bowl

Secure lid on pressure cooker, making sure vent valve is on seal

Set timer to cook for 30 minutes

Once timer goes off you can slow release or quick release

Remove meatloaf and place on an oven safe dish, combine ketchup and brown sugar and brush on both loaves, place under broiler for 3-5 minutes

Remove rack from Instant Pot, add remaining potato ingredients and mash with handheld mixer, potato masher or a fork until combined