If the chicken breasts are larger, cut them horizontally so they are uniform in size. Add them to a bowl with the lime juice, olive oil, and taco seasoning. Let marinate 15-30 minuets. Do not marinate longer or the chicken will break down in the lime juice.
To cook the chicken: Heat a heavy skillet over medium-high heat. Add a small drizzle of olive oil. Cook for 4-5 minutes per side depending on the thickness. Let rest for 5 minutes and then chop into bite-sized pieces. This chicken is great on the grill as well, cook for 4-5 minutes per side.