Prepare the Chicken:

1. Preheat the Oven: Preheat your oven to 375°F (190°C).
2. Pound the Chicken: Place the chicken breasts between two pieces of plastic wrap or parchment paper. Gently pound the chicken to an even thickness using a meat mallet. This ensures the chicken cooks evenly and is easier to stuff.
3. Season the Chicken: Rub the chicken breasts with olive oil, and season them with salt, pepper, thyme, garlic powder, and onion powder on both sides.

Stuff the Chicken:

4. Stuff the Chicken: Create a pocket in each chicken breast by cutting horizontally through the thickest part of the breast, being careful not to cut all the way through. Stuff each pocket with a generous spoonful of cranberry sauce and several pieces of Brie cheese. Press the edges of the chicken closed to seal the filling inside.

Cook the Chicken:

5. Sear the Chicken: Heat a large oven-safe skillet over medium-high heat and add a little olive oil. Once hot, sear the stuffed chicken breasts for 2-3 minutes per side, until golden brown.
6. Bake the Chicken: Transfer the skillet to the preheated oven and bake for 20-25 minutes, or until the chicken is fully cooked through (internal temperature should reach 165°F/74°C). The Brie should be melted and the cranberry sauce warmed through.

Serve:

7. Rest the Chicken: Let the chicken rest for a few minutes before slicing it into rounds to serve.
8. Serve and Garnish: Serve the stuffed chicken with your choice of sides, such as roasted vegetables, mashed potatoes, or a fresh green salad.