Soak sweet potato noodles in hot water for 30 minutes until soft, then drain.
Heat 1 tablespoon of vegetable oil in a pan over medium heat.
Add the sliced onions and sauté until translucent (about 3 minutes).
Add carrots and bell peppers, cooking for another 5 minutes.
Stir in mushrooms and cook for an additional 3 minutes.
Push vegetables to one side of the pan and add the remaining oil.
Pour in the beaten eggs, scrambling until fully cooked.
Add the drained noodles to the pan with the vegetables.
Pour in soy sauce, sesame oil, and sugar, mixing well to combine.
Add blanched spinach and toss everything together until heated through.