Step 1

Place chicken in a medium saucepan and add water to cover by 2 inches. Bring to a boil. Reduce heat to a simmer and cook until an instant-read thermometer inserted into the chicken registers 165 degrees F, 12 to 15 minutes. Transfer the chicken to a clean cutting board and let cool for 5 minutes; shred or chop into bite-size pieces.

Step 2

Meanwhile, whisk vinegar, oil, salt and pepper in a large bowl. Add edamame, romaine, tomatoes, cucumber, feta, basil, olives, onion and the chicken; toss to coat.