Preheat oven to 350 degrees F. Grease one 9- or 10-inch tube/Bundt pan.
Mix white sugar and cinnamon in a plastic bag. Cut biscuits into quarters. Shake 6 to 8 biscuit pieces in the sugar cinnamon mix. Arrange pieces in the bottom of the prepared pan. Continue until all biscuits are coated and placed in the pan. If using nuts and raisins, arrange them in and among the biscuit pieces as you go along.
In a small saucepan, melt the margarine with the brown sugar over medium heat. Boil for 1 minute. Pour over the biscuits.
Bake at 350 degrees F for 35 minutes. Let bread cool in pan for 10 minutes, then turn out onto a plate. Do not cut! The bread just pulls apart.
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.