Boil the pasta in salted water in a separate pot according to the package instructions.
8 ounces pasta
Thinly slice or dice the chicken into bite sized pieces. Peel and finely dice the onion, and grate the garlic. Wash the spinach.
1 pound chicken breasts, 4 garlic cloves, 1 onion, 2 cups spinach
Warm up olive oil in a larger pot or skillet over medium heat. Add diced or sliced chicken breasts, and cook for a few minutes until the chicken is cooked through and slightly golden brown on the surface. Remove the chicken from the pot, and set it to the side. Shred or dice the chicken into smaller pieces.
1 teaspoon olive oil
Add diced onion and garlic to the pan, and sauté for a few minutes until the onion is soft and translucent. Add red pepper flakes and Italian seasoning, and sauté for another minute.
⅛ teaspoon red pepper flakes, ½ teaspoon Italian seasoning
Add butter to the onion, and melt it. Add flour, and stir to allow the flour and butter to form a paste around the onion.
1 tablespoon butter, 1 tablespoon all-purpose flour
Gradually add cream to the onion paste while you stir to incorporate the liquid evenly. A thick sauce will form.
1 cup heavy cream
Add drained cooked pasta, shredded cooked chicken and washed spinach to the creamy sauce.
Stir to combine the ingredients evenly. Add Parmesan cheese, and season with salt and pepper to taste.
½ cup Parmesan cheese, ¼ teaspoon black pepper, ¼ teaspoon salt