This side pairs well with London broil, lamb burgers, or grilled chicken.
Preheat oven to 450 degrees. Place peppers, cut side up, on a rimmed baking sheet. Drizzle with olive oil. Divide garlic among peppers. Sprinkle with oregano and season with salt and pepper. Roast until flesh is tender and skin is blistered in spots, 35 minutes. Transfer peppers to a platter and top with a small handful torn basil leaves.