Soak cashews in boiling water for 30 minutes, then drain, reserving 3/4 cup of water.
Cook chicken with Cajun seasoning until cooked through; set aside.
Sauté vegetables for 3-4 minutes, then add spices and tomato paste, cooking until fragrant.
Blend soaked cashews with reserved water until smooth, then add to the skillet with cooked pasta and chicken. Simmer until sauce thickens, adding more broth or water as needed.
Garnish with parsley and serve hot.
Notes
Reserve pasta water to adjust sauce consistency and enhance flavor.