Combine brown sugar, salt, garlic powder, chili powder, onion powder, smoked paprika, in a small bowl. Set aside.
Remove the membrane from the underside of the ribs by sliding a butter knife under and gripping it with a paper towel and pulling it off. Cut the rack of ribs into 3-4 equal portions (depending on the size). Rub all sides of each piece of ribs with the spice mixture.
Pour the beef broth (and liquid smoke if desired) into the instant pot. Add the ribs in a teepee formation so they meet at the top standing on end. Close and lock the lid and set to sealing. Select manual, high pressure and set the timer for 30 minutes. Allow 10 to 15 minutes for the instant pot to come up to pressure.
Preheat the oven to 425°F Line a baking sheet with aluminum foil and set it aside.
Once the instant pot is done cooking, let it sit for 10 minutes, then release any pressure carefully using the quick-release method. Remove the lid.
Transfer the ribs to the prepared baking sheet lined with foil. Brush the ribs on all sides with your BBQ Sauce or Homemade BBQ Sauce.
Bake in the preheated oven for about 7 minutes. Turn the ribs over and continue baking until meat pulls away easily from the bone, about 7-10 minutes more. Ribs are the most tender at an internal temperature of 200°F.
Serve with your favorite side dish like corn on the cob, loaded baked potatoes or cornbread.