Season the chicken: Pat the sliced chicken dry. Toss with salt, pepper, and Italian seasoning so every piece is coated.
Brown the chicken: Heat olive oil in a large skillet or Dutch oven over medium-high.
Add chicken in a single layer and cook 4–6 minutes, stirring once or twice, until lightly browned and just cooked through. Transfer to a plate.
Sauté aromatics: Lower heat to medium. Add garlic, red pepper flakes, and sun-dried tomatoes to the same pot.
Cook 30–60 seconds until fragrant, scraping up any browned bits.
Simmer the base: Pour in the chicken broth and bring to a lively simmer. Taste and adjust salt if needed.
Cook the ramen: Add the ramen bricks and press them into the liquid. Cook 2–3 minutes, stirring and breaking up the noodles as they soften.
Keep the simmer steady; the starch will help thicken the sauce.
Add the cream and cheese: Reduce heat to medium-low. Stir in the heavy cream, then sprinkle in the Parmesan a little at a time, stirring until melted and smooth.
Finish with greens and chicken: Return the chicken to the pot with any juices. Add the spinach and fold until just wilted, about 1 minute.
Brighten and serve: Stir in lemon juice.
Taste and adjust with more salt, pepper, or Parmesan. Top with fresh basil and extra cheese. Serve hot.