Make sauce in a small mixing bowl by whisking together the hoisin sauce, soy sauce, sesame oil, chicken broth, cornstarch, and sugar.: The bowl will shimmer as the liquids combine, releasing a fragrant nutty and savory scent, and you will notice the cornstarch suspending the sauce into a silky slurry. Whisking integrates the sweet and salty elements so they hit every bite evenly, and preblending prevents lumps when you add it to the hot pan. A common mistake is adding cornstarch directly to a hot pan, which creates clumps, so always dissolve it first. Keep the sauce nearby, and if it thickens before you use it, whisk in a splash of warm broth to loosen it.
Cook noodles according to package directions. Drain, rinse and set aside.: As the noodles simmer, watch how they swell and soften, releasing a faint wheaty aroma; this is your cue to check for doneness. Drain and rinse quickly to stop the cooking and remove excess starch that can make them sticky, then shake off the water and set aside. This step is essential because overcooked noodles become mushy in the final toss, while undercooked ones stay too firm; aim for tender with slight resistance. A typical oversight is leaving noodles to sit in hot water after draining, which continues to cook them, so move them to a colander and rinse under cool water promptly.
Add olive oil to a large skillet or wok over medium-high heat. Add cabbage, carrots, sprouts, and minced garlic. Saute for 2-3 minutes or until the cabbage is limp.: You will see the oil shimmer just before it reaches the ideal searing point, and that shimmer tells you the pan is hot enough to sear without smoking. Add the oil, swirl to coat the surface, and let it heat for a few seconds so it creates a slick surface for quick cooking. If the oil smokes heavily, reduce the heat slightly, because burned oil will impart an acrid flavor. Keep a spatula or tongs at hand so you can move quickly when the vegetables go in.
Reduce heat to medium and add noodles to the pan along with the sauce. Cook, stirring occasionally, for 5-6 minutes.: When the vegetables hit the hot oil, they will sizzle and pop, and that sound signifies moisture leaving the vegetables and crisp edges forming. Stir constantly so the cabbage softens evenly and the carrot warms through while retaining structure; add the bean sprouts a little later if you want them crisper. The garlic will perfume the pan rapidly, so watch closely and stir to prevent scorching, because burnt garlic tastes bitter and can ruin the balance. Aim for tender crisp vegetables with some golden flecks for visual contrast.
Top with garlic salt to taste. Add green onions and serve warm.: During these minutes you will notice the cabbage strands wilt and reduce in volume, their edges taking on a slight translucence. This brief cook preserves texture and freshness while allowing the vegetables to mingle. The timing matters because overcooking will make them watery and soft, and undercooking leaves them too raw compared to the noodles. Keep tasting and watching for that soft yet structured feel, and adjust the heat if the pan starts to smoke or the vegetables brown too quickly.
Reduce heat to medium and add noodles to the pan along with the sauce: When you introduce the cooked noodles and poured sauce into the skillet, the pan will hiss softly as the sauce hits the hot surface, producing an aromatic lift. Toss gently to distribute the sauce, so the glossy mixture clings to every strand and vegetable piece. Reducing the heat prevents the sauce from evaporating too fast, ensuring it thickens and coats rather than dries out. A common mistake is stirring too vigorously which can break delicate noodles, so fold carefully until everything looks evenly coated.
Cook, stirring occasionally, for 5 to 6 minutes: As the mixture simmers, the sauce will slowly reduce and become shinier, and you may hear a gentle sizzle as moisture escapes. Use this time to test flavors and texture, pulling a forkful to check that the noodles have absorbed some sauce but remain springy. The reason for this gentle cook is to bind flavors and slightly caramelize edges without turning the noodles sticky. Avoid leaving the pan unattended, because the sauce can thicken too much or begin to stick to the bottom, in which case a splash of warm broth rescues the texture.
Top with garlic salt to taste: Sprinkling the seasoning will amplify the savory notes and add an herbaceous lift from the parsley in the blend, sharpening the final flavor. Add conservatively, taste, and adjust; you can always add more, but you cannot take it away. Over-salting is the most common trap here, so season little by little and taste as you go.
Add green onions and serve warm: Scattering the green onions at the finish brings a fresh, bright scent and a crisp oniony texture that contrasts with the soft noodles. Serve immediately so the contrast between silky noodles and crisp vegetables remains vivid. A typical mistake is letting the dish sit too long after adding the onions, which softens them and dulls the contrast, so plate and enjoy right away.