1/3 cup light brown sugar, packed
3 tablespoons kosher salt
1 tablespoon paprika, smoked or regular
1 teaspoon freshly ground black pepper
1/2 teaspoon ground chipotle chili powder
1/2 teaspoon dried thyme
1/2 teaspoon ground mustard
1/2 teaspoon garlic powder
1/2 teaspoon onion powder
1/4 teaspoon cayenne pepper
2 full racks baby back pork ribs, trimmed of excess fat, membrane removed, patted dry
1 1/2 cups barbecue sauce
Gather the ingredients.
Position a rack in the center of the oven and heat to 250 F. Combine the brown sugar, salt, paprika, pepper, chipotle, thyme, mustard, garlic powder, onion powder, and cayenne pepper in a small bowl.
Place each rack of ribs in the center of its own large piece of heavy-duty aluminum foil. Apply the dry rub to each side of the 2 racks (more so on the meat side).
Wrap each rack in foil. Put the 2 foil-wrapped racks on a rimmed baking sheet.
Bake for 2 hours until the meat is fully cooked and tender but not falling off the bone.
Remove the ribs from the oven. Using tongs, open the foil. Place racks on 1 piece of foil on the baking sheet, meat-side up. Brush barbecue sauce on both sides. Turn up the oven temperature to 350 F.
Return ribs to the oven and continue cooking, brushing with more barbecue sauce about every 15 minutes, until the ribs are fork-tender and well-glazed, about 30 to 45 minutes total.
Let rest for 15 minutes before cutting and serving.
Cut ribs can be tossed in additional sauce if desired.