Algerian Flafla (Bell Pepper Salad)

Heat the 1 tablespoon olive oil in a skillet over medium heat. Add the chopped red onion and cook, stirring frequently, until the onion has softened and turned translucent, about 5 minutes. Stir in the crushed garlic, salt, and pepper, then add the chopped roasted peppers and diced plum tomato. Continue to cook over medium heat, stirring occasionally, until the tomato is soft and the mixture is well incorporated, about another 5 minutes.