Bring a pot of salted water to a boil. Cook the pasta according to the package instructions, opting for the shortest recommended cooking time. Reserve at least 1 cup of pasta water. While the pasta is boiling, cook the chicken. In a cold large skillet, add the chicken, olive oil, 1 teaspoon of the salt, black pepper, and cajun seasoning. Toss to combine.
8 ounces shortcut pasta, plus about 3/4 cup pasta water, 1 pound boneless skinless chicken breast, cut into bite sized pieces, 1 1/2 Tablespoons olive oil, 1 1/2 teaspoons Morton kosher salt, divided*, fresh cracked black pepper, 1 teaspoon Cajun seasoning without salt*
Increase the heat to medium high, Sauté the chicken until fully cooked, then transfer it to a bowl and cover with foil to keep warm.
Reduce the heat to medium low, add the onion to the pan. Do not wipe out any of the brown bits in the pan from the chicken. Sauté for 5-6 minutes, or until softened. Add the garlic and sauté for an additional 2 minutes.
1/2 yellow onion, finely diced, 10 cloves garlic, minced
Stir in the flour and Italian seasoning, and sauté for 2 minutes.
2 Tablespoons all purpose flour, 1 teaspoon Italian seasoning
Increase the heat to medium and deglaze the pan with about 3/4 cup of reserved pasta water, scraping up the brown bits from the bottom. The mixture should thicken.
Stir in the half and half, remaining salt, and black pepper. Bring it to a light boil. Cook for about 2 minutes, or until slightly thickened.
1 cup half and half
Add the spinach and cook for about 1 minute or until just wilted.
1 5- ounce clamshell spinach
Reduce the heat to low and stir in the Parmesan cheese until melted. Add the Greek yogurt and cooked chicken, stirring until well combined.
1 cup shredded parmesan cheese, 1 cup Greek yogurt
Add the cooked pasta and toss until everything is well mixed. Use additional pasta water as needed to achieve the desired sauce consistency.