Slice the chicken breasts into very thin strips, about the length of your finger.
In a bowl, whisk together the lime juice, olive oil, garlic, salt, cumin, chili powder, and red pepper flakes. Add the chicken and toss to coat. Marinate for 1 hour.
Heat a large cast iron skillet over high heat and add 1 tablespoon olive oil. Add the chicken along with the marinade and sauté until fully cooked, about 5 to 7 minutes. Remove the chicken from the skillet and set aside.
Add the sliced vegetables to the skillet and sauté until tender and lightly charred, about 5 minutes. Return the chicken to the skillet and toss everything together.
Serve with warm flour tortillas and top with guacamole, sour cream, and fresh lime juice.
The Best Chicken Fajitas · Dinner Match Lab | Dinner Match Lab