Shredded Chicken Stew (Pollo Sudado)

6 small chicken breasts
1 cup homemade chicken stock (keep in the freezer and defrost when needed)
sazon packet, cumin 1-2tbsp, cayenne, s/p, chili powder, chives (fresh from garden), 1/2 tsp taco seasosing
tomatoes rough chopped
1 red onion sliced
frozen veggie mix corn,carrots,green bean
celery chopped
olive oil
1 serrano pepper from the garden chopped fine

I baked the chicken in the oven because I saved half of it for another dish..in the oven at 400F for 30min.  Start onions with some olive oil in a pan.  Add the chicken, tomatoes, seasosing, celery, serrano. Shred the chicken right in the pan.  Add chicken stock. Let simmer on low for half hour~