Soak the rice noodles in hot water for about 15 minutes until soft; drain and set aside.
If using chicken or shrimp, slice into bite-sized pieces. For tofu, press to remove moisture and cube.
Heat vegetable oil in a skillet over medium-high heat. Add minced garlic and stir-fry for 30 seconds.
Add bell peppers, carrots, and broccoli; stir-fry for about 3 minutes until tender.
Add protein to the skillet and cook for about 5 minutes until fully cooked.
Incorporate the soaked rice noodles and soy sauce into the skillet; toss gently for another 3 minutes until everything is well combined.
Serve topped with chopped green onions.