Prepare Prepare your chicken as indicate your chicken as indicated.
Marinate. In a large bowl, use a whisk to combine together the olive oil, brown sugar, paprika, thyme, allspice, garlic powder, onion powder, cinnamon, cayenne, salt, pepper, and lime juice. Then place the chicken into the bowl and toss the ingredients so that the chicken is well coated with the other ingredients.
Cook. Preheat your skillet over medium-high heat for two minutes. Then add the chicken to the skillet and cook for five to six minutes per side until nicely caramelized and fully cooked through. Transfer the cooked chicken to a cutting board to rest for five minutes before slicing as desired.
Dressing. To make the dressing, in a medium sized bowl, use a clean whisk to combine together the dressing ingredients.
Assemble To assemble the salad, start by arranging the romaine, mango, cucumber, red onion, avocado, and toasted nuts in a large serving bowl (I prefer a more shallow bowl for this). Then you can arrange the chicken over the ingredients in the bowl and drizzle the dressing on top. Serve the salad with the chopped cilantro on top and with additional dressing as desired.