Pre-heat oven to 180c
Spray a large, oven-proof casserole dish (with a lid) with low calorie cooking spray, and stir-fry the onions for a few minutes until they start to soften
Move the onions over to one side of the pan, and lay the chicken on the empty side to start frying
Add in the celery, garlic and peppers, and stir everything together
Pour in the chopped tomatoes, add the mixed herbs and balsamic vinegar, and stir everything together. Use one of the empty chopped tomato tins to add about 200ml water
Sprinkle in the fresh parsley, season with salt and pepper, stir once more. Place the lid on the casserole dish, and pop on the bottom shelf of the oven
Oven-bake for 1 hour.
Once you remove from the oven, give it a good stir. If it’s looking a little watery then give it a simmer on the stove-top to reduce it down a bit.
Serve with a little fresh parsley sprinkled over the top, and a few grinds of black pepper.
