Combine 2 tablespoons sesame oil, soy sauce, honey, hot chile sauce, vinegar, and garlic in small bowl.
Cut flank steak against the grain into bite-sized strips.
Combine steak strips with 2 tablespoons of soy sauce mixture. Cover and refrigerate for 30 minutes, up to overnight.
Heat large skillet or wok to medium-high heat.
Add steak and cook until cooked through, about 5-8 minutes.
Remove from skillet.
Add additional 2 tablespoons sesame oil and cook shallots, mushrooms, and slaw mix until softened, about 10 minutes.
While vegetables are cooking, prepare noodles according to package.
Add noodles, beef, and the rest of the sauce mixture, and stir well to combine and cook a couple of additional minutes to warm up the sauce.
Serve topped with green onions.
Enjoy!