Mung Bean Noodles vs Sweet Potato Noodles: Key Differences

Published by Anthony
on November 7, 2026

Compare mung bean noodles with sweet potato noodles by starch, thickness, texture and Chinese cooking uses, plus preparation tips and sensible substitutions.

Quick Answer: Which Glass Noodles Should You Choose?

Mung bean noodles and sweet potato noodles are both starch-based glass noodles. Common mung bean vermicelli is fine and threadlike; many sweet potato versions have thicker strands or flat shapes with a more substantial bite. Both become translucent when cooked.^[1][5]

Choose fine mung bean threads for dishes built around a tangle of thin noodles.
Choose sweet potato noodles when the recipe calls for thicker, springy strands.
Read the ingredient list: a glass-noodle product may contain a starch blend.^[2][3]

The starch name alone does not set the cooking time. Thickness, shape and the individual product’s directions matter too.

Compare the starch and actual strand shape before cooking

On the shelf, these noodles can look surprisingly similar. Start with the recipe’s intended texture, then compare the package’s ingredients and shape before deciding how to prepare it.

Read the Starch, Not Just the Noodle Name

Fine bean threads are often called Fen Si (粉丝, fěn sī), while thicker starch noodles are commonly called Fen Tiao (粉条, fěn tiáo). These useful names do not replace an ingredient list. A product sold as bean threads can combine mung bean starch with potato starch rather than containing mung bean alone.^[3][4]

Likewise, sweet potato noodles are made from starch, not simply long pieces of the vegetable. A manufacturer’s plain sweet potato version can list sweet potato starch and water. Expect a relatively neutral carrier for sauce rather than the taste of roasted sweet potato.^[2]

Both belong within the broad glass-noodle family. Rice vermicelli is a separate category even when its thin dry strands look similar. The Chinese noodles guide gives the wider context for these different noodle families.^[1]

Mung Bean vs Sweet Potato Noodles at a Glance

Noodle	Typical form and cooked texture	Preparation implication
Mung bean vermicelli	Fine, pale dry threads that become translucent and slippery after cooking.	Fine strands often soften quickly; allow for further cooking in sauce.^[1][6]
Sweet potato starch noodles	Commonly thicker round strands or flat strips with a springy, substantial bite.	Match soaking and cooking to the actual thickness and shape.^[2][5]

The table describes common market forms. For the pan, compare the actual strand width as well as the starch: both affect how the noodle fits the recipe.

Choose for the Chinese Dish You Want

Ants Climbing a Tree (蚂蚁上树, mǎ yǐ shàng shù): fine glass noodles mingle with ground pork and a savory, spicy sauce. The noodles absorb liquid quickly, so the amount of stock affects how saucy the finished dish is.^[6]
Suan La Fen (酸辣粉, suān là fěn): hot-and-sour noodle soup commonly uses slippery sweet potato starch noodles. Mung bean vermicelli can substitute, with a different strand texture. This is a useful dish to explore alongside Sichuan cuisine.^[4]
Cabbage braise: thicker sweet potato noodles work with napa cabbage in a savory braising liquid. A fine mung bean replacement needs a shorter cooking period rather than simply following the thicker noodle’s timing.^[5]

Cold noodle salads offer another use for fine mung bean threads. Cooked, cooled and well-drained noodles carry dressing alongside crunchy vegetables. Avoid leaving the dressed salad sitting so long that the noodles become overly soft.^[8]

How to Prepare the Noodles You Have

Use these checkpoints with the package directions and the recipe, rather than treating them as one fixed cooking schedule.

Check the form: identify the starch, strand thickness and whether the recipe expects soaking, boiling or cooking directly in liquid.
Rehydrate as directed: soaking should make the noodles pliable before their final cooking stage. Do not assume every starch noodle needs the same water temperature or soaking time.^[4][8]
Finish for the dish: cook until tender with the intended bite, then drain or combine with sauce as directed. For a cold salad, cool and drain them thoroughly before adding dressing.^[4][8]

Noodles that are flexible after soaking may still need cooking. For a sauced dish, leave enough liquid for absorption and check the texture as it finishes. Stop cooking when the strands have the recipe’s intended bite, before they turn overly soft.^[6][8]

Can You Substitute One for the Other?

Often, yes. Chinese cabbage braises and hot-and-sour soups can accept either type, but the result and preparation change. Fine mung bean threads give a lighter tangle; thick sweet potato noodles provide a more pronounced strand to bite through.^[4][5]

Prepare the replacement according to its own needs. Do not carry over the original noodle’s soaking or boiling time unchanged. If it is already fully cooked before entering the pan, keep its final cooking brief enough to preserve the texture you want.

Sauce and broth quantities may need attention as well. In a dry-looking stir-fry, the noodles can be taking up the cooking liquid rather than merely needing more oil.^[6]

Buying and Keeping Dried Glass Noodles

Find these noodles in Asian grocery stores, sometimes under several English names: bean threads, vermicelli, cellophane noodles or glass noodles. Check the actual starch and the illustrated or visible strand shape.^[1][7]

For sweet potato noodles, Korean grocery stores are also useful. Keep the dry package well sealed in a cool place and follow its storage instructions.^[7]

FAQs About the Two Glass Noodles

Are either of these rice vermicelli?

No. Mung bean and sweet potato glass noodles use different starches from rice vermicelli. Similar dry appearance and the word “vermicelli” can be misleading.^[1]

Are Korean glass noodles the same as sweet potato noodles?

Korean dangmyeon commonly uses sweet potato starch and is the noodle used for japchae. Check the package, since “glass noodles” also covers other starches.^[7]

Do both types need soaking?

Many Chinese recipes soak them before cooking. Water temperature and duration vary by product and dish, so use the actual directions.^[4][8]

Which type tastes sweeter?

Do not expect sweet potato starch noodles to taste like the roasted vegetable. Both are usually chosen for their texture and ability to carry seasoning; the sauce does much of the flavor work.^[2][6]