Preheat oven to 400°F
Slice chicken 3/4 of the way through making sure not to cut all the way through.
Cut apples into slices
Cut gouda into slices
Place one slice of apple and one slice of gouda into each opening of chicken
Season with freshly chopped thyme, salt, and pepper.
Place chicken in pan and cover with aluminum foil.
Bake for 30-40 minutes until chicken is cooked.