The Best Cheese for Toasties
The best cheese for toasties is a good mature cheddar, ideally grated and mixed with a little mozzarella or red Leicester: cheddar brings flavour, mozzarella brings stretch, and red Leicester melts smoothly and gives colour. Gruyère, Comté, fontina and Emmental are excellent upgrades. Avoid using only very aged, crumbly or fresh cheeses, which tend to go oily, grainy or watery.
Quick answer: For a classic UK toastie, use 40–50 g of grated mature cheddar, or a 2:1 mix of mature cheddar and low-moisture mozzarella. For a richer melt, try cheddar and Gruyère. Grate it yourself from a block; pre-grated cheese contains anti-caking agents that melt less smoothly.
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What makes a cheese melt well
Cheese is a network of milk proteins (mainly casein) holding fat and water. When it heats, the fat softens first and the protein network loosens, letting the cheese flow. How well that happens depends on a few things:
- Moisture: younger, moister cheeses melt more easily. Very dry, aged cheeses like Parmesan barely flow.
- Age: as cheese matures, proteins break down. Moderately aged cheese melts smoothly; very old cheese can split, releasing oil and leaving grainy curds.
- Acidity: cheeses made with acid rather than rennet (paneer, halloumi, ricotta, many fresh goat's cheeses) soften but don't flow.
- Fat: reduced-fat cheese melts less well and can turn rubbery.
In a sealed toastie maker the cheese has only 3–4 minutes to melt, so grating it is the single biggest improvement you can make.
Cheeses compared
| Cheese | Melt | Stretch | Flavour | Notes |
|---|---|---|---|---|
| Mild cheddar | Excellent | Some | Mild | Great for kids; can taste flat |
| Mature cheddar | Very good | Some | Strong, tangy | The UK default; best all-rounder |
| Extra mature / vintage cheddar | Fair | Little | Very strong | Can go oily; blend with a younger cheese |
| Red Leicester | Excellent | Some | Mellow, nutty | Smooth melt and orange colour |
| Double Gloucester | Very good | Some | Buttery | Lovely with onion |
| Low-moisture mozzarella | Excellent | Excellent | Mild, milky | Blend for stretch |
| Fresh mozzarella (ball) | Good | Good | Milky | Wet: drain, pat dry, slice thinly |
| Gruyère / Comté | Excellent | Good | Nutty, savoury | Superb with ham or mushrooms |
| Emmental | Excellent | Very good | Mild, sweet | Classic for croque monsieur |
| Fontina / Taleggio / raclette | Excellent | Good | Rich, savoury | Very smooth, indulgent |
| Monterey Jack | Excellent | Good | Mild | Good with chilli and jalapeños |
| Brie / Camembert | Good (soft) | Little | Rich | Use slices; pairs with cranberry |
| Lancashire / Wensleydale / Cheshire | Fair | Little | Fresh, crumbly | Soften rather than flow; blend |
| Stilton / blue cheese | Fair | Little | Very strong | Use a little, with cheddar |
| Feta / halloumi / paneer | Doesn't melt | No | Salty / mild | Add for flavour, with a melting cheese |
| Processed slices | Excellent | Smooth | Mild | Emulsifying salts give a perfect, if bland, melt |
The best blends
| Blend | Ratio | Why it works |
|---|---|---|
| Mature cheddar + mozzarella | 2:1 | Flavour plus stretch; the classic upgrade |
| Mature cheddar + red Leicester | 1:1 | Tangy, smooth and very British |
| Cheddar + Gruyère | 1:1 | Nutty, rich and deep |
| Gruyère + Emmental | 1:1 | Alpine melt; great with ham |
| Cheddar + Monterey Jack | 1:1 | Mild, gooey; good with spicy fillings |
| Extra mature cheddar + processed slice | 40 g + 1 slice | The processed slice helps strong cheddar stay smooth |
Why grated beats sliced
Grated cheese has much more surface area, so it melts evenly in the short cooking time of a toastie maker. Slices can leave a cold, firm centre while the bread is already golden. Grate cheese from a block on the coarse side of a box grater. Pre-grated supermarket cheese is coated with potato starch or similar anti-caking agents, which can make the melt slightly grainy; it is fine in a hurry.
Let cheese come out of the fridge 10 minutes before cooking if you can, especially for deep fill machines.
How much cheese to use
About 40–50 g of grated cheese fills a standard two-triangle toastie maker without leaking; 60–80 g suits deep fill plates. More than that tends to escape the seal and burn onto the plates. See how to stop toasties leaking for quantities with other fillings, and our best toastie makers for cheese toasties for machines that seal well.
Cheeses to use with care
- Very aged cheddar and Parmesan: great flavour but prone to splitting. Use as a small part of a blend or grate a little Parmesan onto the outside butter for a crisp crust.
- Fresh mozzarella and burrata: high moisture can make bread soggy. Drain and pat dry, and use a caprese toastie method.
- Crumbly British cheeses: Wensleydale, Lancashire and Cheshire soften but don't flow. Mix with cheddar.
- Feta, halloumi, paneer: they don't melt. Pair with mozzarella, as in our spinach and feta toastie.
- Reduced-fat cheese: tends to go rubbery. Use a smaller amount of full-fat instead.
- Vegan cheese: melt varies hugely between brands. See our vegan toastie guide.
Best cheese by toastie type
- Ham and cheese: Gruyère or Emmental with a little cheddar. See the ham and cheese toastie.
- Tuna melt: mild or mature cheddar, which holds its own against mayo and tuna.
- Beans: mature cheddar, grated finely so it binds the beans.
- Spicy fillings: Monterey Jack or a cheddar and mozzarella mix to cool the heat.
- Sweet-savoury: brie with cranberry, or a crumbly Wensleydale blended with cheddar and a little chutney.
Putting it together
The perfect cheese works best with the right bread (best bread for toasties) and fat on the outside (butter or mayo). For the full method, follow our classic cheese toastie recipe, then explore more combinations in toastie filling ideas.
FAQs
Why does my cheese go oily in a toastie?
Very mature cheeses and long cooking cause the fat to separate from the proteins. Use a mature rather than vintage cheddar, blend it with a younger cheese, and don't overcook.
What cheese gives the best cheese pull?
Low-moisture mozzarella gives the best stretch, followed by Emmental, Gruyère and fontina. Mixing one of these with cheddar gives both stretch and flavour.
Is pre-grated cheese OK for toasties?
Yes, it works, but its anti-caking coating melts slightly less smoothly than freshly grated cheese. Freshly grated from a block is noticeably better.
What cheese is best for a cheese and onion toastie?
Mature cheddar, or a mix of cheddar and red Leicester or Double Gloucester. Our cheese and onion toastie recipe covers the onion prep.