Preheat oven to 410°F (210°C).
Slice the potatoes. Chop the onions and the bell peppers. Combine together.
Add the flour, parsley and cheese. Season with salt and pepper.
Put into a buttered casserole dish.
Pour the cream over (heated, if you like; as is, if you’re short on time and/or pots).
Top with some butter pieces.
Bake for 75 minutes.