Stir together the ancho powder, pasilla powder, cumin, coriander, ginger, brown sugar, garlic powder, onion powder, allspice, cinnamon, cloves, fennel, chile de arbol, 2 tablespoons salt, black pepper and cayenne in a small bowl.
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Brush both sides of the breasts with the oil and season with salt. Rub the top side of each breast with a few tablespoons of the rub and place on the grill, rub side down. Grill until golden brown and slightly charred, 3 to 4 minutes. Turn the breasts over and continue grilling until just cooked through, 4 to 5 minutes longer.
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