Prepare the rice noodles by boiling them according to the instructions on the package until al dente.
Cut the chicken breasts into thin strips and let them soak in soy sauce for about 30 minutes for flavor.
In a large skillet or wok, warm up sesame oil over medium heat and add the marinated chicken. Sauté until the chicken is fully cooked and no longer pink.
Incorporate minced garlic, fresh ginger, and chopped onions into the skillet, cooking until the onions become translucent.
Add sliced mushrooms and diced cucumbers, continuing to cook until the mushrooms soften.
Stir in bell peppers, shredded carrot, peanut sauce, oyster sauce, and a splash of hot chili pepper sauce, allowing everything to heat through and meld together.
Combine the cooked rice noodles with the stir-fried mixture, tossing well to ensure the noodles are evenly coated with the sauce.
Serve hot, garnished with a sprinkle of sesame seeds on top for an added crunch.