Cook the pasta in salted water until al dente and set aside.
While the pasta is cooking, heat a large skillet on medium heat. Add olive oil and 1 tb butter. Coat the salmon with 1 tb Cajun seasoning and cook the salmon for 3-4 minutes on each side. Salmon is cooked when it reaches 145°F and is flakey on the inside. Set aside.
In the same pan, add 1 tb butter and onions. Sauté for 2 minutes then add garlic and sauté for 1 minute.
Add in heavy cream and chicken broth and bring to a gentle simmer. Add in remaining 2 tb Cajun seasoning and parmesan cheese and simmer for 3-5 minutes.
Toss in spinach and cooked pasta and cook for 1 minute until the spinach is wilted. Top with salmon and more parmesan cheese. Happy nomming!
Notes
Salt levels in Cajun seasonings will vary depending on brands and homemade versions. Adjust according to your taste.