Healthy salad with chicken and celery

(2 portions) 1 or 2 chicken breast (depending on size) 2 celery sticks 1 yellow pepper 1/2 of an iceberg lettuce head 1 avocado for the vinaigrette: 1 tea spoon of wholegrain mustard 1 tb spoon of lemon juice 100 ml extra virgin olive juice salt, pepper(optional) Preheat the oven (200o C). Bake the chicken…