In a large bowl, combine olive oil, chicken, onion powder, Italian herbs, cayenne pepper, smoked paprika, salt, and pepper. Stir until chicken is well coated. Let marinate for 15 minutes.
Heat a skillet over medium heat. Add the marinated chicken and sauté for about 7-10 minutes, or until fully cooked. Remove from heat and let cool slightly.
While the chicken cooks, bring a pot of salted water to a boil. Add the pasta and cook according to package directions, usually around 8-10 minutes, or until al dente. Drain and set aside.
In a small bowl, whisk together the Greek yogurt, mayo, Dijon mustard, lemon juice, and additional salt to taste to create the dressing.
In a large mixing bowl, combine the cooked pasta, arugula, cheddar cheese, grape tomatoes, avocado, and green onions. Gently toss to combine.
Slice the cooled chicken and add it to the pasta mixture, followed by the dressing. Toss until everything is well coated. Adjust seasoning if necessary.
Serve immediately, garnished with fresh basil leaves.