Cook chicken: Heat olive oil in a large deep skillet or pot. Add chicken strips, season with salt and pepper, and cook until golden brown. Remove and set aside.
Sauté garlic & tomatoes: In the same pot, sauté garlic for 30 seconds, then add sun-dried tomatoes. Cook until fragrant.
Add liquid & pasta: Pour in chicken broth and heavy cream. Stir and bring to a gentle simmer. Add pasta and cook uncovered, stirring occasionally, until pasta is al dente (12–14 minutes).
Make it creamy: Stir in Parmesan cheese until melted and sauce thickens.
Combine: Add cooked chicken and spinach. Toss everything together until spinach wilts and chicken is coated in the creamy sauce.
Serve: Garnish with extra Parmesan and chili flakes if desired.