Chinese Chicken Stir Fry

• 4 chicken breast fillets
• 3 garlic (cloves)
• 325 ml homemade chicken broth
• 140 gr bell pepper (diced red)
• 90 gr green onion (sliced)
• 80 gr mushrooms (fresh)
• 45 ml sherry
• 45 gr dry rosted pecan (unsalted)
• 30 ml soy sauce (light)
• 24 gr cornstarch