Place all meatloaf ingredients in a large bowl. Mix well.
Pat meatloaf into the 7 inch springform pan.
Add two cups of water to the Instant Pot. Place the trivet inside the pot.
Lower the meatloaf into the pot.
Lock the lid onto the Instant Pot. Point the steam valve to sealing.
Set the Instant Pot on manual for 25 minutes at high pressure.
Once the timer beeps, release the pressure from the Instant Pot using a quick release. Once the float valve has dropped, remove the lid.
Carefully remove the meatloaf with the trivet from the pot. Check the meatloaf for doneness with an instant read thermometer to make sure the internal temperature is 160° F. Place the thermometer into the middle of the meatloaf to get an accurate reading.
Run a knife around the edge of the spring form pan before releasing meatloaf. Remove outer ring.
Place meatloaf onto a cookie sheet.
Combine the ketchup and brown sugar topping in a small bowl. Pour over the meatloaf.
Place the meatloaf under the oven broiler until the topping bubbles. Don't leave it too long or it will burn.