Preheat the oven to 450°F. Line a rimmed baking sheet with high-heat-resistant parchment paper or foil.
Cut the bell peppers into quarters, then remove the seeds and membranes.
4 bell peppers
Place the peppers on the prepared baking sheet. Drizzle them with olive oil and use your hands to coat them well.
2 tablespoons olive oil
Sprinkle the peppers with salt, pepper, garlic powder, oregano, and red pepper flakes.
½ teaspoon Diamond Crystal kosher salt, ¼ teaspoon black pepper, ½ teaspoon garlic powder, ½ teaspoon dried oregano, ¼ teaspoon red pepper flakes
Roast until tender and charred in spots, about 20 minutes. Serve immediately.
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Notes
Seasonings, especially salt, are guidelines. Adjust to taste
Different pepper colors make for a pretty presentation, enough to serve this dish to guests. There are also subtle flavor differences between different-colored bell peppers, making for a more interesting dish all around, not just visually.
There's no need to turn the peppers midway through baking.
There's no need to peel the peppers.
These peppers keep well in a sealed container in the fridge for 3-4 days. To serve the leftovers, gently reheat them in the microwave at 50% power or serve them cold like antipasti.