I shamelessly stole this recipe from my husband, and it's definitely a favorite around our house. We normally grill our chicken, but this recipe also cooks up great on the stove in around half an hour.
For an extra punch of flavor, marinate your chicken breasts in a bowl of zesty Italian salad dressing. Leave them overnight in the refrigerator, then take them out when you're ready to cook. Cut the chicken breast into small cubes, and dice up some yellow onion and fresh cilantro. Sauté the chicken and onion over medium heat in a little fresh lime juice, making sure to add the onion a few minutes after the chicken. Season your chicken in the pan with your favorite spices (we use salt, black pepper, and a tiny bit of cayenne).
Serve in corn tortillas, topped with the freshly chopped cilantro. Shredded pepper jack cheese and sour cream also make great toppings — but are completely optional, because the chicken is so darn good by itself!