Heat a skillet over medium-high heat. Brush chicken breasts on both sides with extra virgin olive oil then season with salt and pepper. Saute for 4-5 minutes a side or until no longer pink in the center. Remove to a plate then let rest for 5 minutes and slice.
In the meantime, divide lettuce between plates. Top with cucumber slices, cherry tomatoes, cashew halves, cheddar cheese, and the cooked chicken.
Notes
Feel free to cook the chicken ahead of time then add on top of the salad chilled.