For even more smoky flavor, grill the peppers and mushrooms.Meal Plan: Bagel crisps and steamed broccoli and carrots make good accompaniments to this dish.
In medium saucepan, combine potatoes and enough cold water to cover. Bring to a boil, reduce heat and simmer until tender, about 12 minutes. Drain, cool slightly, then cut potatoes in half. Transfer to large bowl.
Meanwhile, preheat broiler. In medium bowl, combine mushrooms, 1 tablespoon oil, 1⁄8 teaspoon salt and 1⁄8 teaspoon freshly ground pepper. Place on broiler pan and cook, turning occasionally, until nicely colored and tender, about 6 minutes. Set aside.
In small saucepan, combine peppers, garlic and remaining 1 tablespoon oil. Cook gently over medium-low heat, stirring, 5 minutes. Remove from heat and stir in vinegar, 1⁄8 teaspoon salt and 1⁄8 teaspoon freshly ground pepper.
Add beans, basil, reserved mushrooms and red pepper mixture to potatoes and toss gently. Serve at room temperature.