Bring a large pot of salted water to a boil. Cook the pasta until al dente according to package instructions.
Cook the chicken
Heat olive oil in a large skillet over medium-high heat. Add the chicken and cook for 5–6 minutes, stirring occasionally, until golden and cooked through.
Build the sauce
In the same skillet, reduce heat to medium. Add garlic and cook about 30 seconds until fragrant.
Stir in the chopped sun-dried tomatoes, oregano, chili flakes, and lemon juice. Cook another 30–60 seconds to release the flavors.
Make it creamy
Pour in the heavy cream and bring to a gentle simmer.
Add the parmesan cheese and stir until the sauce becomes smooth and slightly thickened.
Add the spinach
Stir in the fresh spinach and cook until just wilted.
Combine everything
Add the cooked pasta and chicken back to the skillet. Toss everything together, and add a splash of water if needed.