Preheat the oven to 160°C.
In a large, heavy-based lidded (casserole) dish, heat the oil (on the stove) and brown the chicken, whilst seasoning with salt and pepper.
Add the garlic and stir for about 1 minute, then pour in the wine. Simmer for a few minutes.
Slice the peppers into strips.
When the liquid has reduced by half, add the passata and the pepper slices.
Put the lid on, then put the dish in the oven. Cook for about 1 hour, until the chicken is golden and the sauce is nice and thick.
Serve hot.