Cook the pasta according to package instructions.
While the pasta cooks, season chicken breasts with salt and pepper.
In a skillet over medium heat, cook the chicken for about 6-7 minutes on each side until fully cooked through and golden brown.
In a bowl, whisk together mayonnaise, sweet chili sauce, Sriracha, and garlic powder until smooth.
Once the chicken is cooked, slice it into strips.
Add the cooked pasta and chicken to the skillet with the sauce.
Toss in sliced green onions and adjust seasoning if needed.
Serve hot, garnished with sesame seeds if desired.