Step 1

Preheat oven to 300°F. Coat bottom of a sheet pan with olive oil. Stir together paprika, chile powder, garlic powder, onion powder, 3/4 teaspoon of the salt, and 1/2 teaspoon of the pepper in a small bowl until blended. Sprinkle all sides of ribs with spice mixture, and place ribs in a single layer in prepared sheet pan. Cover tightly with aluminum foil, and bake in preheated oven until ribs are tender and can be pulled apart with a fork, about 1 1/2 to 2 1/2 hours.

Step 2

Meanwhile, whisk together ketchup, molasses, vinegar, Worcestershire, chopped chiles, and remaining 1 teaspoon salt and 1/2 teaspoon pepper in a medium bowl. Pour half of sauce into a small bowl, and reserve for serving.

Step 3

Remove ribs from oven, and increase oven temperature to 450°F. Uncover ribs, and drain any accumulated juices from sheet pan. Baste ribs with remaining sauce. (Discard any unused basting sauce.) Bake ribs at 450°F, uncovered, until ribs are very tender and sauce has become sticky and slightly glazed on ribs, about 20 minutes. Serve ribs with reserved sauce.