Start by marinating the chicken in half a cup of mango cilantro salad dressing. Set aside for 15 minutes.
Add olive oil to a grill pan, and cook the chicken for 15 minutes, turning halfway. Let it rest for 5-10 minutes before slicing.
To assemble the salad, add lettuce, cucumbers, bell peppers, avocado, cilantro and grilled chicken to a large bowl. Pour the dressing on top and toss to combine. Serve immediately or the salad will get soggy.