In a small bowl, combine the chili sauce, mayonnaise, and sriracha. Mix well until thoroughly blended. Set aside.

Cut the tofu into 1/2-inch dice and place in a bowl. Sprinkle with the cornstarch and salt and pepper to taste and toss to coat the tofu.

Heat the oil in a large nonstick skillet over medium-high heat. Add the tofu and stir-fry until golden brown, about 8 minutes. Toss the tofu with the reserved sauce and serve hot.