Prep all your vegetables. In a small blender make a slurry by combining milk, flour and cream cheese. Set aside. Season chicken generously with Cajun seasoning, garlic powder and salt. Prepare pasta in salted water according to package directions. Heat a large heavy nonstick skillet over medium-high heat; spray with cooking spray and add half of the chicken. Sauté 5 to 6 minutes or until done, set aside on a plate and repeat with the remaining chicken. Set aside. Add olive oil to the skillet and reduce to medium; add bell peppers, onions, and garlic to skillet, sauté 3-4 minutes. Add mushrooms and tomatoes and sauté 3-4 more minutes or until vegetables are tender. Season with 1/4 tsp salt, garlic powder and fresh cracked pepper to taste. Reduce heat to medium-low; add chicken broth and pour in slurry stirring about 2 minutes. Return chicken to skillet; adjust salt and Cajun seasoning to taste, cook another minute or two until hot, then add linguine; toss well to coat. Top with chopped scallions and enjoy!