In a skillet, heat the olive oil over medium heat. Add the shredded rotisserie chicken, chili powder, cumin, garlic powder, onion powder, salt, and pepper. Stir to combine and cook for about 5 minutes, until heated through.
While the chicken is heating, warm the tortillas in a separate skillet or microwave until soft and pliable.
To assemble the tacos, place a generous scoop of the seasoned chicken on each tortilla.
Top with shredded lettuce, diced tomatoes, and shredded cheese.
Add a dollop of sour cream and a spoonful of salsa on top.
Garnish with fresh cilantro if desired. Serve immediately.