Most pumpkin seeds come out of the oven chewy in the middle and bland all the way through. Both problems have the same cause, and both are fixed before the seeds ever reach the baking sheet.
Boil them first. Ten minutes in heavily salted water seasons the seed through the shell instead of leaving salt sitting on the outside, and it starts softening the hull so it crisps rather than toughens. Then dry them properly. Water on the surface steams the seeds, and steamed seeds never go crunchy no matter how long you leave them in.
How to clean pumpkin seeds
Do not try to pick the strings off by hand. Drop the whole mess of pulp and seeds into a big bowl of cold water and swish it around. The seeds float and most of the pulp sinks, so you can lift the clean seeds off the top with a spider strainer or your fingers.
Change the water once if it looks orange and cloudy. Two rinses is usually enough.
How to dry pumpkin seeds
Tip the boiled seeds into a colander, then spread them in one layer on a clean tea towel or a couple of sheets of kitchen paper. Press another towel on top and pat firmly.
They should look matt, not shiny. If you can see any wet gleam on the shells, keep patting. This is the single step most recipes skim over and it is the one that decides whether they crisp.
How long to roast pumpkin seeds, and at what temperature
325F for about 25 minutes, stirring every eight to ten minutes so the edges of the tray do not run ahead of the middle.
Hotter is a common mistake. At 400F the shells colour and taste toasted before the inside has dried out, so you get a seed that looks done and is still leathery to bite. Low and slow dries the whole seed through, which is what crunch actually is.
They carry on crisping as they cool, so pull them when they are golden rather than deep brown.
How to season pumpkin seeds
Toss the dried seeds in just enough oil to coat, then add your seasoning before they go in the oven. A little brown sugar alongside the salt is worth trying: it does not read as sweet, it just rounds the salt off and helps them colour.
- Rosemary and flaky salt - what this recipe uses. Chop the rosemary fine or it burns.
- Smoked paprika and garlic powder - add the paprika in the last ten minutes so it does not scorch.
- Cinnamon and sugar - toss these on straight out of the oven while the oil is still warm.
- Soy sauce and sesame oil - use in place of the salt, and dry the seeds even more thoroughly first.
Pumpkin seeds in an air fryer
Same preparation, less time. Boil, dry and season exactly as above, then air fry at 325F for 12 to 15 minutes, shaking the basket every five.
Work in a single layer and do not fill the basket. Piled seeds trap steam and you are back to chewy.
Are pumpkin seeds healthy?
They are genuinely good for you. Pumpkin seeds are high in magnesium, zinc and plant protein, and roasting them at home means you control how much salt and oil goes on, which is where shop-bought ones usually go wrong.
The shells are fine to eat and that is where most of the fibre sits. Hulled green seeds sold as pepitas are a different product and will not behave like this in the oven.
Storing them
Cool them completely on the tray before they go anywhere. Warm seeds put into a jar make their own condensation and go soft overnight.
Once properly cool they keep in an airtight jar at room temperature for about a week, and they are at their best on day one.
The seeds come out of the same pumpkin as the filling. If you are baking rather than carving, see our pumpkin pie recipe for what to do with the flesh.