First combine all of the spice ingredients into a small bowl to make the dry rub.
Next coat the ribs evenly with rub.
Then put the trivet and the water and optional apple cider vinegar into the bottom of the Instant Pot.
Place the baby back ribs into the Instant Pot, curling it or slicing it in half so it'll fit into the Instant Pot.
Place the lid on the Instant Pot and make sure the knob is set to “sealed.” Hit "manual" then select "high" and change time to 18 minutes.
Allow the Instant Pot to perform a 10 minute "natural pressure release" and then carefully release the rest of the pressure.
Next, turn your oven to broil (high). Line a baking sheet with aluminum foil.
Transfer the ribs to the baking sheet. Coat your ribs with your favorite barbecue sauce. Then place the ribs under the broiler for 6-7 minutes or until the barbecue sauce starts to caramelize.
Remove the ribs from the oven and coat with a little more BBQ sauce if desired.