01 -
Slice each chicken breast horizontally to create a butterfly opening without cutting through. Pat dry for better searing.
02 -
Season the inner sides of the chicken breasts with salt, pepper, and thyme. Layer baby spinach or arugula leaves, green apple slices, and Brie cheese evenly inside.
03 -
Fold each chicken breast over the filling carefully, pressing edges together. Use toothpicks if needed. Mix Dijon and coarse ground mustard; brush half of the mixture over the top surfaces.
04 -
Heat olive oil in a large skillet over medium-high heat until shimmering. Place chicken mustard-side down and sear for 3 to 4 minutes until golden. Flip carefully, brush remaining mustard on top, and sear the other side for 3 to 4 minutes.
05 -
Reduce heat to medium-low, cover skillet, and cook for 5 to 8 minutes until chicken reaches an internal temperature of 165°F and cheese is melted.
06 -
Transfer chicken to plates and spoon pan sauce and melted cheese over the top. Serve hot.