Marinate chicken breasts in the dressing for 2-3 hours.

Preheat oven to 375 degrees F.

Carefully cut chicken horizontally, but not all the way through.

Open chicken breasts and layer on sundried tomatoes, spinach, feta, and mozzarella.

Fold the top of the chicken breast back over the filling and pin the opening shut with a few toothpicks.

Sear meat in an oiled cast iron pan until golden on both sides.

Cover and bake for 10-15 minutes, or until chicken is cooked through.

ENJOY!