Break fettucine noodles in half and place them in a large pot of boiling salted water. Cook until al dente, drain and rinse.
Heat oil in skillet or wok over medium heat. Add the soy sauce, green onions, bean sprouts, cayenne, pepper, garlic powder and pasta. Stir and cook for 2 to 3 minutes. Transfer to serving plates and garnish with toasted sesame seeds.