Add potatoes into bottom on {6 Quart} Instant Pot. Pour in stock or broth and add in garlic and salt. Stir. Put in pats of butter on top.

Mix meatloaf ingredient together in a bowl. I use my hands to combine it and shape it into a round loaf.

Add trivet on top of potatoes. Wrap foil up around the meatloaf to make a pocket around it. Add more ketchup on top to cover and spoon around evenly. 

Lock on lid and make sure the valve is closed. Set to manual high pressure for 30 minutes.

Once it completes cooking, you may carefully open valve to manual release or let it release naturally.

Remove carefully with pot holders or tongs and put on a baking sheet and broil in oven until ketchup caramelizes a bit, if desired.