Firecracker chicken stir-fry

Name: Firecracker chicken stir-fry
Prep time: 10 min
Cook time: 15 min
Total time: 25 min
Cuisine: Italian
Ingredients: Low-calorie cooking spray; 3 skinless and boneless chicken breasts, cut into chunks; 1 onion, thickly sliced; 1 red, 1 yellow and 1 orange pepper, deseeded and sliced into chunky strips; 200g mangetout; 225g water chestnuts, drained and sliced; 250g dried medium egg noodles; 1 level tbsp sesame seeds, toasted