Balsamic Salad (Chicken or Vegetarian)

• 300 g chicken breast
• 2 tbsp balsamic vinegar
• 1 tbsp honey
• 2 tbsp extra virgin olive oil
• 1 red onion, thinly sliced
• 200 g baby spinach
• 1 green apple, cored and thinly sliced
• 200 g cherry tomatoes, halved
• 1 avocado, thinly sliced
• 50 g feta
• .5 cup walnuts, crushed