Heat olive oil in a large skillet over medium-high heat.
Add chicken breasts to the skillet and cook until no longer pink, about 5 to 7 minutes.
Sprinkle taco seasoning over the chicken, stirring to coat evenly. Cook for an additional 2 to 3 minutes.
Warm the flour tortillas in a dry skillet or microwave until pliable.
Assemble the tacos by placing chicken strips in the center of each tortilla.
Top with diced tomatoes, salsa, chopped jalapeños, chopped fresh cilantro, sour cream, shredded cheese, and shredded lettuce. Enjoy!