First, place salmon fillets, skin side down, into a large skillet over medium heat. Season fillets with 1 teaspoon each of of kosher salt and black pepper.
Add 1/2 cup of water to the skillet and cover skillet. Allow the salmon to steam for 5-6 minutes.
While the salmon is cooking, scrub and rinse the vegetables thoroughly and dice into small pieces. Cut the lemon in half.
Once salmon is opaque and fully cooked through, use a spatula to extract the salmon from the skillet and place it on a plate. Set aside.
To the same skillet over medium heat, add 1 tablespoon of olive oil.
Add the chopped celery and bell pepper. Use a wooden spoon to stir veggies for 3 minutes, until tender.
Add in the garlic powder, cajun spice, 1 teaspoon salt, and 1 teaspoon black pepper and stir until the vegetables are coated.
Gently pour in the chicken broth, chopped tomatoes, and cream. Stir gently to disperse. Turn heat to high and allow to come to a boil.
Once the liquid is bubbling, add in the pasta. Stir until well combined. Use your wooden spoon to pat down the pasta, ensuring that each noodle is submerged in liquid. Allow to come back to a boil.
While the pasta is cooking, use two forks to shred the cooled salmon fillets into bite-sized pieces.
Once the contents of the skillet have returned to a boil, stir well, and reduce heat to medium. Add in the shredded salmon and chopped parsley.
Squeeze the juice of one lemon on top.
Continue to stir for 15 minutes until most of the liquid is absorbed and the pasta is al dente in texture.
Serve immediately, while hot. Top with additional parsley or grated cheese.