Heat the oil in a medium skillet over medium-high heat.
Add the turkey and ½ teaspoon each salt and pepper. Cook, breaking the meat up with a spoon, until no longer pink, 5 to 6 minutes.
Pour off any excess liquid. Stir in half the salsa and cook until heated through, about 1 minute.
In a small bowl, combine the sour cream and remaining salsa.
Divide the lettuce, chips, turkey mixture, beans, avocado, Cheddar, and olives (if desired) among bowls. Serve with the dressing.