Margherita Chicken

Prep Time: 5 minutes
Cooking Time: 45 minutes
Serves 4
Ingredients
- Low-calorie cooking spray
- 1 small onion, peeled and finely diced
- 1 400g tin chopped tomatoes
- 1 tsp garlic granules
- 200ml chicken stock
- 4 chicken breasts
- Basil
- 140g mozzarella
- Pepper