Sprinkle chicken with salt, pepper and garlic salt to taste. Heat butter in a large skillet over medium heat; add chicken and sauté about 3 minutes.
Spoon chicken evenly onto tortillas. Top with cheese and green onions; fold up sides and roll up, burrito-style. Heat oil in a large skillet over medium-high heat. Add rolled-up tortillas and sauté until golden. Serve with your choice of toppings and over lettuce leaves; if desired.