Garlic Parmesan Chicken Spaghetti in Spicy Cajun Cream Sauce

Ingredients

• 12 oz (340 g) spaghetti
• 1 1/4 lb (565 g) boneless skinless chicken breasts, sliced into thin cutlets
• 1/3 cup (40 g) all-purpose flour
• 1/2 cup (50 g) finely grated Parmesan cheese
• 2 teaspoons Cajun seasoning
• 1 teaspoon smoked paprika
• 1/2 teaspoon garlic powder
• 1/2 teaspoon kosher salt, plus more for pasta water
• 1/4 teaspoon black pepper
• 1 tablespoon olive oil
• 2 tablespoons unsalted butter
• 5 cloves garlic, minced
• 1 cup (240 ml) low-sodium chicken broth
• 1 1/2 cups (360 ml) heavy cream
• 3/4 cup (75 g) freshly grated Parmesan cheese
• 1/4 teaspoon cayenne pepper, optional
• 1/2 teaspoon red pepper flakes, optional
• 1/2 cup (120 ml) reserved pasta water, plus more as needed
• 2 tablespoons chopped fresh parsley
• Extra Parmesan, for serving