Place rice noodles in medium bowl. Cover with hot water; let stand 15 minutes or until soft. Drain well; cut into 3-inch lengths
Combine soy sauce, sugar, lime juice and chiles in small bowl until well blended; set aside
Meanwhile, heat oil in large skilled over medium-high heat. Add tofu; cook and stir 4 minutes per side or until golden brown. Remove with slotted spatula to paper towel-lines wire rack.
Add jicama to skillet; cook and stir 5 minutes or until lightly browned. Remove to baking sheet. Cook sweet potatoes in batches until tender and browned, turning once. Remove to wire rack. Add leeks; cook and stir 1 minute; remove to wire rack.
Stir soy sauce mixture; add to skillet. Heat until sugar dissolves. Add noodles; toss to coat. Gently stir in tofu, vegetables, peanuts, mint and cilantro.