Heat the oven to 450°F and line a rimmed sheet pan with foil.
Toss the chicken, peppers and onion with the olive oil, paprika, cumin and salt, then spread everything in a single uncrowded layer.
Roast for 10 minutes, turn the chicken and vegetables and roast for 7 to 9 minutes more, until the chicken reaches 165°F and the pepper edges blister.
Wrap the tortillas in foil and warm them on a corner of the pan during the final 5 minutes.
Squeeze the lime over the chicken mixture and divide it among the warm tortillas.