1Bring a large pot of salted water to a boil. Add the spaghetti and cook according to package instructions until al dente. Drain and set aside.
While the pasta is cooking, slice the chicken breast into thin strips. Slice the zucchini and carrots into matchsticks. Mince the garlic cloves.
In a large pan or wok, heat the sesame oil over medium-high heat. Add the minced garlic and sauté for about 30 seconds until fragrant.
Add the sliced chicken breast to the pan and cook for 4-5 minutes, stirring occasionally, until the chicken is cooked through and lightly browned.
Add the zucchini and carrots to the pan. Stir-fry for 2-3 minutes until the vegetables are just tender.
In a small bowl, mix the gochujang and soy sauce together. Pour this sauce over the chicken and vegetables, stirring well to coat everything evenly.
Add the cooked spaghetti to the pan. Toss everything together for 2-3 minutes until the pasta is well coated with the sauce and heated through.
Taste and adjust seasoning if needed. Serve hot, garnished with extra sesame seeds or sliced green onions if desired.