Soak the rice noodles in hot water for about 10 minutes, or until they are soft but not mushy. Drain and set aside.
Heat the vegetable oil in a large skillet or wok over medium-high heat.
Add the minced garlic and sauté for about 30 seconds until fragrant.
Toss in the sliced bell peppers, julienned carrots, and broccoli florets. Stir-fry the vegetables for about 3-4 minutes until they start to soften.
Add the soaked rice noodles to the skillet, stirring well to combine with the vegetables.
In a small bowl, mix together soy sauce, oyster sauce, lime juice, and sugar. Pour this sauce over the noodle and vegetable mixture, tossing everything to coat evenly.
Stir-fry for an additional 2-3 minutes until everything is heated through and well combined.
Serve hot, garnished with fresh cilantro if desired.