If using 20 oz. steak strips, follow same instructions as 10 oz. steak strips, working in batches, if necessary.
If using whole chicken breasts, pat dry and, on a clean cutting board, cut into 1” dice. Follow same instructions as steak strips in Steps 2 and 3, stirring occasionally until chicken reaches minimum internal temperature, 5-7 minutes.
If using filets mignon, pat dry. Follow same instructions as steak strips in Step 2, cooking undisturbed until well browned and steaks reach desired doneness, or 4-6 minutes per side for medium/medium-well. Rest, 3 minutes. Slice steaks before assembling quesadillas.
If using shrimp, pat dry. Follow same instructions as steak strips in Steps 2 and 3, cooking undisturbed until well browned, 2-3 minutes on one side, then stirring constantly until shrimp reach minimum internal temperature, 2-3 minutes.