In a mixing bowl, combine the chopped spinach, feta cheese, cream cheese, sun-dried tomatoes, minced garlic, oregano, thyme, salt, and pepper. Mix until well incorporated and creamy.
Using a sharp knife, create a pocket in each chicken breast. Take care not to cut all the way through.
Stuff each chicken breast with the creamy spinach and feta mixture, using toothpicks to secure the edges if necessary.
Heat olive oil in a large oven-safe skillet over medium-high heat. Sear the chicken breasts for 3-4 minutes on each side, or until golden brown.
Pour the chicken broth into the skillet around the chicken, then transfer the skillet to the preheated oven.
Bake for 25-30 minutes, or until the chicken is fully cooked through (internal temperature should reach 165°F/74°C).
Once done, remove from the oven and let the chicken rest for 5 minutes before removing toothpicks.
Garnish with freshly chopped parsley before serving.
Notes
Let the chicken rest before serving for better flavor.