Preheat the oven to 300ºF.
In a small bowl, stir together the paprika, cumin, oregano, brown sugar, salt, garlic powder and cayenne.
Remove the membrane from the ribs and then rub the ribs with the oil. Rub the spice mixture all over the ribs, and then arrange them in a single layer on a large, rimmed baking sheet.
Bake in the preheated oven for 2 to 2 ½ hours, until the meat is tender and crisp on the edges.