Place the noodles in a pot of boiling water. Boil according to package instructions (dry usually boil for 8 minutes, fresh for about 3 minutes). Drain on a colander, place in a bowl and toss with 1 teaspoon oil. Set aside.
Combine sauce ingredients in a small bowl and set aside.
In a large skillet or wok heat up 1 tablespoon oil. Add mushrooms and cook on high heat until softened and browned. Then add onions, carrots and cabbage or coleslaw mix. Stir fry for a couple minutes.
Add garlic and cook another minute, stirring.
Transfer cooked vegetables into a bowl or plate and set aside.
In the now empty skillet add the remaining 1 tablespoon oil and cook shrimp until pink and very lightly browned, stirring often. Remove from the skillet and set aside.
In a now empty skillet pour in the sauce and quickly bring to boil. Add cooked vegetables and cooked and drained noodles into the skillet and cook for 3-4 minutes, stirring, until the noodles are evenly covered in sauce and the stir-fry is heated through. Taste and season with salt and pepper to taste.
Stir in the cooked shrimp.
Season with salt and pepper and sprinkle with sliced scallions.