Bring a large pot of salted water to a boil and cook pasta according to package instructions until al dente.
Season chicken pieces with salt and pepper. Heat olive oil in a large skillet over medium-high heat.
Sear chicken until golden brown and cooked through, approximately 5-7 minutes. Remove chicken from skillet and set aside.
In the same skillet, add minced garlic and sauté for 1 minute until fragrant.
Add chicken broth, heavy cream, sun-dried tomatoes, oregano, and red pepper flakes. Simmer for 3-5 minutes until the sauce slightly thickens.
Stir in the grated parmesan cheese until melted and smooth.
Add the cooked chicken and fresh spinach to the sauce, stirring until spinach is wilted.
Toss the cooked pasta into the skillet with the sauce until well-coated. Serve immediately.