Preheat oven to 375°F (190°C). Season chicken breasts generously with taco seasoning on both sides.

In an oven-safe skillet, heat olive oil over medium-high heat. Sear chicken for 3-4 minutes per side until golden brown.

Transfer skillet to the oven and bake for 20-25 minutes until internal temperature reaches 165°F (74°C).

Let the chicken rest for a few minutes before shredding it with two forks.

Assemble tacos by filling tortillas with shredded chicken and topping with diced tomatoes, shredded cheese, cilantro, and sour cream.

Serve immediately and enjoy!