Prepare the Chicken: Season both sides of the chicken breasts with salt and pepper.
Cook the Chicken: In a large skillet, heat the olive oil over medium-high heat. Add the chicken breasts and cook for about 5-6 minutes on each side, or until they are golden brown and cooked through. Remove the chicken from the skillet and set aside.
Sauté the Garlic: In the same skillet, add the minced garlic and sauté for about 30 seconds until fragrant.
Add Spinach and Tomatoes: Stir in the chopped spinach and sun-dried tomatoes, cooking until the spinach wilts, about 2-3 minutes.
Create the Sauce: Lower the heat to medium, then pour in the heavy cream. Stir to combine, allowing the cream to warm up.
Add Cheese and Seasoning: Mix in the Parmesan cheese and Italian seasoning, stirring until the cheese melts and the sauce thickens slightly, about 3-4 minutes.
Return the Chicken: Place the cooked chicken back into the skillet, spoon some sauce on top, and let it simmer for an additional 2-3 minutes to heat through.
Serve Hot: Remove from heat, garnish with fresh basil, and serve.