If needed, pound chicken to even thickness. Sprinkle adobo seasoning salt onto both sides of the chicken.
Heat grill or grill pan to medium-high heat. Lightly coat grill rack with oil. For broiler method, see Note, below. Grill chicken until cooked through, 5 to 6 minutes per side. Transfer to a cutting board.
Cut chicken crossways into thin strips. To serve, spoon about 1/4 cup chicken strips onto a tortilla. Add fresh salsa, guacamole, shredded lettuce, shredded cheese and sour cream.