Prepare peanut sauce. Place all ingredients in a blender and blend until smooth. If needed to thin, add water 1 Tbsp at a time. Set aside.
Heat 2 quarts water to boiling, remove from heat, add noodles and cover. Let sit until noodles reach desired firmness, then drain. Meanwhile, heat oil in a skillet, add tofu and cook until lightly browned. Add green onions and sauté 1 minute.
Stir together noodles, tofu and sauce and serve.