Add water to a large stock pot, add in the ½ pinch of salt and bring it to a boil over medium high. Gently place the pasta into the water and reduce the heat to medium. Boil for 10-15, checking for al dente pasta (see post for details). Drain the pasta and set aside. Start with step 2 while pasta is cooking
Heat a skillet over medium and add 2 tablespoons of olive oil. Season chicken with seasoned salt and black pepper, and add the chicken to the skillet. Cook for 5 minutes per side. Remove the chicken from the skillet and set aside.
Slice sausage into ½ thick slices. Add the sausage to the same skillet and cook for 2-3 minutes, and flip to cook the other side. Once the sausage is cooked, remove from the skillet and set aside.
If using frozen shrimp, be sure that it is thawed out completely. Season shrimp with cajun seasoning. Place the shrimp in the skillet and cook for one minute per side (do not overcook). Remove the shrimp and set it aside.
Add remaining olive oil, and 4 tablespoons of butter to the same skillet. Next add the bell pepper strips, onion, diced tomato, and garlic. Sauté for 6 minutes until veggies are tender and crisp.
Gently pour in heavy cream and mix it into the pepper and onions. Add the parmesan cheese, and all of the seasonings and spices. Let this simmer over medium-low.
Slice up the cooked chicken breast to desired bite-size pieces. Add the chicken, sausage, and shrimp into the creamy sauce and mix until thoroughly combined.
Mix pasta in with the cream sauce and combine well.