How to Make It
In a large skillet, heat 3 tablespoons of the olive oil until shimmering. Add the bell peppers and cook over moderate heat, stirring occasionally, until softened, about 12 minutes. Transfer the peppers and any olive oil to a bowl.
Add the remaining 3 tablespoons of olive oil to the skillet along with the garlic and crushed red pepper and cook over moderate heat until fragrant, about 20 seconds. Add the tomatoes, cover and cook, stirring and crushing the tomatoes occasionally, until they are slightly softened, about 5 minutes. Return the bell peppers to the skillet. Add the oregano and season with salt and pepper. Cover and cook over moderately low heat until the sauce is slightly thickened, 2 to 3 minutes. Stir in the chopped basil and serve warm or at room temperature.
Miniature bell peppers (no bigger than 2 inches) are available at supermarkets and specialty food shops.