Season chicken breasts with salt and pepper on both sides. Heat olive oil in a large skillet over medium-high heat and cook chicken until golden and fully cooked. Set aside to cool, then cut into bite-sized cubes.
In the same skillet, melt butter. Add minced garlic, sun-dried tomatoes, and spinach. Cook until spinach wilts and garlic is fragrant.
Pour in heavy cream and bring to a gentle simmer, stirring occasionally. Once the sauce thickens slightly, remove from heat.
Add salt, pepper, and Italian seasoning to the sauce. Stir in grated Parmesan cheese until melted.
Cook penne pasta according to package instructions until al dente. Drain and add to the skillet with the sauce. Toss well to coat.
Mix in the diced chicken and gently combine. Serve hot, garnished with extra Parmesan and parsley if desired.
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Notes
Store leftovers in an airtight container in the fridge for up to 3 days. Reheat gently to avoid drying out.