Preheat grill or grill pan. Rub chicken with olive oil, smoked paprika, garlic powder, salt, and pepper. Grill until fully cooked (about 6–7 minutes per side depending on thickness). Let rest, then slice thinly.
In a large bowl, layer greens, papaya, guava, cucumber, and tomatoes.
Top with sliced grilled chicken and sprinkle with seeds or cashews.
Whisk together all dressing ingredients and drizzle over salad just before serving.