Mix together garlic powder, onion powder, paprika, salt, pepper, cumin, chili powder or cayenne pepper. Sprinkle seasoning over ribs (both sides) and drizzle with 2 tbsp. olive oil, rub in. Cover the baking tray with aluminum foil and bake for 2 hours.
During last 5 minutes of cooking time, mix together sauce ingredients. Remove ribs from oven, carefully remove foil and spread the sauce over the top of the ribs.
Increase oven temperature to 460-degrees F. Return ribs to the oven, uncovered, and bake for another 10 minutes. Change the oven setting to broil (high). Leave ribs under the broiler for about 3 minutes to char and caramelize the edges. Remove from oven and let rest 10 minutes before cutting and serving.