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### Ingredients
- 1 (16-ounce) package uncooked fettuccine
- ¼ cup plus 2 tablespoons all-purpose flour, divided
- 1½ teaspoons kosher salt, divided
- 1½ pounds boneless, skinless chicken breast tenderloins, patted dry
- 2 tablespoons olive oil
- 2 tablespoons unsalted butter
- 1 large shallot, finely chopped
- 1 (8-ounce) package fresh sliced cremini mushrooms
- 1½ cups Marsala wine
- 1 cup chicken stock
- 1 cup heavy whipping cream
- 2 teaspoons Italian seasoning
- ½ teaspoon freshly ground black pepper
- ½ teaspoon garlic powder
- 1 (10-ounce) package fresh baby spinach
- 4 ounces Parmesan cheese, finely shredded
- Finely chopped fresh flat-leaf parsley
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