Place first 4 ingredients, cut-sides down, on a foil-lined baking sheet. Broil 20 minutes or until skins are blistered. Cool and remove skins. Cut yellow bell peppers and poblano chiles in strips; set aside.
Place oil in a large nonstick skillet over medium-high heat. Add onion and garlic, and sauté 5 minutes or until onion is tender.
Place tomatoes and red bell peppers in a food processor or blender, and process until smooth. Stir tomato mixture into sautéed onions. Reduce heat to low, and simmer 30 minutes. Stir in yellow bell pepper and poblano chile strips, bay leaves, and remaining ingredients. Simmer 15 minutes or until mixture is thick.