Preheat your oven to 375°F (190°C).

In a bowl, combine the chopped spinach, dried cranberries, cream cheese, salt, and pepper. Mix until well-combined and set aside.

Carefully cut a pocket in each chicken breast by slicing horizontally without cutting all the way through.

Place a slice of brie cheese into each pocket, followed by a generous spoonful of the spinach and cranberry filling.

Use toothpicks to secure the openings of the chicken breasts, ensuring the filling stays inside during cooking.

In an oven-safe skillet, heat olive oil over medium heat. Add the stuffed chicken breasts and sear for about 3-4 minutes on each side until golden brown.

Transfer the skillet to the preheated oven and bake for 25-30 minutes, or until the chicken is cooked through and juices run clear.

Remove from the oven and let the chicken rest for a few minutes before serving.

Enjoy your deliciously cheesy, savory creation!