Butterfly each chicken breast and divide the filling between the breasts. Close the flap around the filling. Sprinkle the outside with salt and pepper.
Heat the butter and oil in a large oven-safe skillet over medium-high heat. Sear both sides of the chicken.
Transfer to the oven and bake for an additional 15-20 minutes or until 165 on a meat thermometer.
Notes
Nutrition: These are large chicken breasts. This meal could easily serve 6 or even 8 people if you slice them and serve them with generous portions of sides.