Preheat the oven to 425 degrees F.
Place the sausages into a low-sided roasting pan (this makes the cooking time quicker).
Slice the halloumi into 1/4-inch slices and then lay them on and around the sausages in the pan.
Take the peppers out of the jar and also strew them around the sausages and cheese, cutting them into smaller slices and pieces as you go, then drizzle over the oil. Cook for 15 to 20 minutes, by which time the sausages should have browned and the cheese colored in places.
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