Add ground beef to large mixing bowl. In a separate bowl – combine dry ingredients. Then add dry ingredients to ground beef and mix well with hands or fork.
In same bowl used for dry ingredients – whisk together wet ingredients. Then add wet ingredients to ground beef mixture and mix well to combine.
Add 2 cups of water to pressure cooker.
Form one large circular loaf with the beef mixture and place in a makeshift pan made of tin foil (roll up sides to contain the meat) steamer basket. Place tin foil with mixture in pressure cooker. Lock lid and cook for 16 minutes at high pressure.
Meanwhile – combine 1/2 cup ketchup and brown sugar with a whisk.
Once cook time is complete, allow pressure to release naturally (about 10 minutes).
Transfer meatloaf to a baking sheet and generously glaze with ketchup mixture.
Place under high broiler for about 3-5 minutes, or until desired caramelization occurs.