Start by seasoning the defrosted halibut fillets. In a small bowl, mix together the smoked paprika, oregano, garlic powder, onion powder, chili flakes, salt, and pepper. Rub this spice mixture onto the halibut fillets, ensuring they are evenly coated.
In a large pot, bring salted water to a boil and cook your pasta according to the package instructions. Once cooked, drain and set aside.
In a large skillet, heat the neutral oil over medium heat. Add the minced onion and bell pepper, sautéing until they are soft and translucent, about 5-7 minutes. Add the minced garlic and sauté for an additional minute until fragrant.
Push the sautéed vegetables to one side of the skillet and add the seasoned halibut fillets to the other side. Cook for 3-4 minutes on each side or until the fish is cooked through and flakes easily with a fork.
Once the halibut is cooked, add the fire-roasted tomatoes and stock (or water) to the skillet. Stir everything together, and sprinkle in the Cajun seasoning and optional chili flakes. Let it simmer for about 5 minutes to meld the flavors.
Reduce the heat to low and add the cream cheese, stirring until it melts and incorporates into the sauce. Finally, toss the cooked pasta into the skillet, ensuring it’s well coated with the sauce.
Remove from heat and sprinkle with minced cilantro for a fresh finish. Serve hot, and enjoy your delicious Cajun Pasta!