In a medium mixing bowl, combine the softened cream cheese, shredded mozzarella cheese, chopped spinach, sun-dried tomatoes, minced garlic, Italian seasoning, salt, and pepper. Mix until well blended.
Place the chicken breasts on a baking sheet lined with parchment paper. Use a sharp knife to cut a pocket into each chicken breast without cutting through entirely.
Spoon the cream cheese filling generously into each chicken breast pocket.
Drizzle olive oil over the stuffed chicken breasts and sprinkle additional salt and pepper on top for added flavor.
Bake in the preheated oven for 25-30 minutes, or until the chicken is cooked through and reaches an internal temperature of 165°F (75°C).
Once done, remove from the oven and let rest for 5 minutes before serving.
Notes
Serve on a plate drizzled with olive oil and topped with fresh basil leaves. Pair with steamed vegetables or a light salad.