Pour one cup of water into the inner pot of the Instant Pot. Place potatoes in larger pan of the Stack N Cook and pour chicken broth over.
Mix together all ingredients for meatloaf except BBQ sauce in a stand mixer or by hand. Mix on low until well combined. Press into smaller top pan of Stack N Cook. Pour BBQ sauce on top and smooth evenly over the meat. Assemble the Stack N Cook and place inside Instant Pot. Set Pressure Cook for 25 minutes.
When done, Quick Release. Pull out Stack N Cook. Add veggies to Instant Pot and set to Steam for 1 minute. Meanwhile, put meatloaf in broiler for a few minutes to brown.
Add half and half, butter, sour cream, garlic powder, salt and pepper to mashed potatoes and mash with potato or bean masher.
Pull out meatloaf from oven and cut like a pie into 6 or 8 slices. Quick Release veggies and add butter, salt & pepper to taste. Serve with mashed potatoes and extra BBQ sauce for meatloaf. Enjoy!