A light coating of starch is the simplest way to keep shredded cheese from clumping. About one to two teaspoons of cornstarch per cup of shredded cheese, tossed until evenly distributed, creates a thin barrier between the strands that absorbs surface moisture and prevents them from fusing into a solid mass. This is essentially the same principle commercial cheese makers use, just scaled down for your kitchen.
Why Shredded Cheese Clumps in the First Place
Cheese is a mixture of fat, protein, and moisture. When you shred it, you dramatically increase the surface area exposed to air, which means more moisture sitting on the outside of each strand. That surface moisture acts like glue between pieces. At the same time, the fat in cheese softens at relatively low temperatures, making the strands tacky enough to press together and bond. The warmer the cheese gets, the worse the problem becomes, which is why a bag of shredded cheese left on the counter for even 20 minutes can turn into a dense brick.
Pre-shredded cheese from the store doesn’t clump as badly because manufacturers coat the strands with anti-caking agents before bagging. These are typically potato starch, cellulose (a plant fiber), or blends of the two, sometimes with calcium sulfate mixed in. The coatings work by absorbing moisture from the cheese surface and physically separating each strand. The FDA considers cellulose safe as a food additive, and it’s generally used at two to four percent by weight in grated and shredded cheese products.
The Cornstarch Method
Cornstarch is the most popular home solution because it’s cheap, widely available, and nearly flavorless once the cheese melts. Sprinkle one to two teaspoons over each cup of freshly shredded cheese, then toss the strands with your hands or shake them in a sealed bag until every piece has a light, even dusting. You’re looking for a barely visible coating, not clumps of white powder.
This works whether you’re prepping cheese ahead of time for a recipe or portioning out a large block into freezer bags. The starch absorbs the thin film of moisture on each strand and creates a physical buffer that keeps the pieces from making direct contact. It’s the same trick commercial producers have been using for decades.
Other Starches and Flours That Work
Cornstarch isn’t your only option. Potato starch and arrowroot powder both work well, and they actually have a more neutral flavor than cornstarch once cooked. Root-based starches like these have larger granules that gelatinize at lower temperatures, which means they dissolve and disappear more readily when the cheese melts. If you’re making a cheese sauce or fondue where you want the smoothest possible result, potato starch or arrowroot are slightly better choices.
All-purpose flour also works in a pinch, though it leaves a faintly starchy taste if the cheese isn’t fully melted. Rice flour is another option for those avoiding corn and wheat. The ratio stays the same regardless of which starch you choose: roughly one to two teaspoons per cup of cheese, adjusted by feel. You want enough to lightly coat each strand without leaving visible residue.
How Anti-Caking Coatings Affect Melting
If you’re shredding cheese for nachos, pizza, or a sauce, you might wonder whether all that starch changes how the cheese melts. The short answer: barely. Research at Virginia Tech found no meaningful difference in the stretchability or meltability of mozzarella whether it was coated with potato starch, cellulose, or left uncoated.
There are a few subtle effects worth knowing about. Potato starch reduced the amount of free oil that pooled on the surface of melted cheese, which means slightly less grease on your pizza. It also slowed moisture loss during baking, which caused the cheese surface to get hotter and brown faster. If you’re baking something where browning matters, like a casserole or pizza, starch-coated cheese will develop golden spots a bit more quickly than uncoated cheese. Cellulose coatings let more moisture escape, keeping surface temperatures lower and browning slower.
For most home cooking, these differences are minor enough that you won’t notice them. But if you’re making a delicate cheese sauce where you want the smoothest melt possible, shredding from a block and using the minimum amount of starch (or none at all, if you’re using it immediately) gives the cleanest result.
Cold Cheese Shreds Better
Temperature matters more than most people realize. Cheese that’s cold and firm produces cleaner strands that are less likely to stick together from the start. Put your block in the freezer for 15 to 20 minutes before shredding. The firmer texture glides across the grater more easily, the strands hold their shape instead of smashing together, and the cold surface stays dry longer.
This is especially important for soft or high-fat cheeses like fresh mozzarella, fontina, or young cheddar. These varieties are sticky at room temperature and can turn into a paste on the grater. A brief freeze firms them up just enough to shred cleanly without changing the texture once they warm back up.
Storing Shredded Cheese Without Clumping
How you store shredded cheese after coating it determines whether it stays loose or re-clumps over the next few days. The goal is keeping moisture away from the cheese surface without drying it out completely.
For short-term refrigerator storage (up to a week), place the starch-coated shreds in a zip-lock bag with the air pressed out, or in an airtight container lined with a paper towel. The paper towel wicks away condensation that would otherwise collect on the cheese and undo your anti-clumping efforts. Replace the paper towel if it gets damp.
For longer storage, freezing works well. Spread the coated shreds in a single layer on a parchment-lined baking sheet and freeze them for about an hour until the individual pieces are firm. Then transfer them to a freezer bag. This flash-freeze step prevents the strands from freezing into one solid clump. Frozen shredded cheese keeps for two to three months and can go straight from the freezer onto pizza or into a sauce without thawing first.
What About Store-Bought Shredded Cheese?
If your pre-shredded cheese is clumping despite the anti-caking agents already on it, the problem is almost always moisture. Every time you open the bag, warm air enters and condenses on the cold cheese. That moisture overwhelms the starch coating and the strands start bonding again.
The fix is simple: squeeze out as much air as possible before resealing, and get the bag back in the fridge quickly. If you’ve bought a large bag you’ll use over several days, consider dividing it into smaller portions so you’re not repeatedly opening the same bag. You can also add a small extra dusting of cornstarch to a store-bought bag that’s starting to clump, tossing it through to re-coat the damp surfaces.