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Preheat oven to 450 degrees F. Line a rimmed baking sheet with parchment paper.
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Cut the bell peppers into quarters, then seed and trim them.
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Place the bell peppers on the prepared baking sheet. Drizzle with the olive oil and use your hands to coat them well.
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Sprinkle the bell peppers with salt, pepper, garlic powder, oregano and red pepper flakes.
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Roast until tender and charred in spots, about 20 minutes. Serve the roasted bell peppers immediately.