How to Make Peanut Butter in a Food Processor

Peanut butter is peanuts and nothing else, ground until the cell walls break down and the oil comes out. Put two cups of roasted, unsalted, shelled peanuts in a food processor, run it in two to three-minute bursts with a scrape-down between each, and in roughly eight to twelve minutes you will have smooth peanut butter. No oil, no water, no liquid of any kind. The only genuinely optional additions are salt and a sweetener, and both go in at the very end.

What you need

Two cups of roasted, shelled, unsalted peanuts — about 10 oz, which makes roughly a standard jar. Raw peanuts work but take noticeably longer, so roast them first (below). Salted peanuts work; just skip the added salt.

A food processor with a wide bowl. Capacity matters in both directions. Two cups of nuts in a 14-cup bowl spreads thin and the blade catches it fine; the same two cups in a 3-cup bowl packs solid and strains the motor. If you own a small machine, halve the batch. The best food processors for nut butter page ranks machines specifically on the headroom this job demands.

A flexible spatula. You will use it four or five times, and a stiff spoon will not clear the wall properly.

Optional: half a teaspoon of fine salt, and a tablespoon of honey or maple syrup. Both at the end only.

The method

Step 1 — roast, if the nuts are not already roasted

Spread the peanuts on a tray and roast at 350 °F for about twelve minutes, shaking once, until they smell nutty and the skins darken. Let them cool for five minutes — warm, not hot. Warm nuts give up their oil far more readily, and this step does more to shorten the grind than any machine upgrade. Do not skip the cooling: genuinely hot nuts can soften a plastic bowl and will steam under the lid.

Step 2 — crumbs (about 60 seconds)

Fit the standard chopping blade — not a dough blade, not a disc — and run the machine. The nuts go to coarse crumbs almost immediately, then to a fine, sandy meal that looks like wet breadcrumbs. Stop at about a minute and scrape the walls.

Step 3 — the dry ball (2 to 5 minutes)

Run it again. The meal gathers into a thick mass that rides up the side of the bowl and the motor note drops. This is the stage described in the callout above. Stop every ninety seconds or so, scrape the mass back down onto the blade, and continue. Expect three or four scrape-downs here. If the machine stops by itself and will not restart, it has tripped its thermal cut-out to protect the motor — leave it half an hour and carry on; nothing is broken.

Step 4 — the oil releases (1 to 3 minutes)

Quite suddenly, the mass goes glossy and starts to move like a liquid, pooling rather than clumping. From that point another two minutes of running is what takes it from “peanut paste” to the texture you recognise from a jar. Do not stop early: the difference between slightly gritty and properly smooth is almost entirely in these last two minutes.

Step 5 — season, then jar

Add salt and any sweetener now and pulse five or six times to combine. Scrape into a clean jar. It will be warm and quite loose, and it firms considerably as it cools — judge the final texture cold, not warm.

What each stage looks like

Five things that go wrong

It is grainy and will not smooth out. Almost always under-grinding, and almost always because oil went in during the dry-ball stage. Keep running it; a few more minutes usually rescues it. If oil was added early, it may stay slightly grainy — use it for cooking and start the next batch dry.

It stalled and the machine stopped. A thermal cut-out doing its job. Wait half an hour. Next time work in shorter bursts, and consider a smaller batch if your machine is at the lower end of published wattage.

It separated in the jar. That is what natural peanut butter does — there is no emulsifier in it. Stir it back together, and store it in the fridge to slow the separation.

It tastes flat. Salt, and roasting. Unroasted peanuts make a noticeably duller butter, and half a teaspoon of fine salt in a jar’s worth changes it completely.

It is too stiff. Judge it cold first, because warm peanut butter is always loose. If it is genuinely too thick for you once cold, a teaspoon of neutral oil stirred in at that point is the right time to add it.

Other nuts, same method

Almonds and hazelnuts take considerably longer than peanuts — they are harder and drier — and the dry-ball stage lasts much longer, which is where most almond-butter attempts are abandoned. Cashews and macadamias are softer and faster. Pecans and walnuts are oily enough that they can go from meal to butter very quickly, so watch them. The best chopper for nuts page covers the opposite job — a coarse chop rather than a paste — and the difference is simply how long you leave the machine running.

Storage

A clean sealed jar in the fridge is the standard advice for home-made nut butter, and chilling also slows the oil separating out. It will be firm straight from the fridge; a few minutes at room temperature makes it spreadable again. There is no preservative in it, so treat it like any other fresh home-made food: clean jar, clean spoon, and use your nose.

Can you do it without a food processor?

A high-powered blender with a tamper does this well and faster, and a blender without a tamper does it badly — the paste wedges above the blade and spins on air. We set out the whole comparison in food processor vs blender for nut butter. An immersion blender cannot do it at all. A mortar and pestle genuinely can, for a small quantity and a lot of effort, because a pestle ruptures cell walls rather than slicing them — which is exactly what releases the oil.

What we are not claiming

We have not made peanut butter in these four machines, and the timings above are the ranges commonly given for this process rather than measurements we took. Every bowl volume, watt figure and control description attached to a pick below is the manufacturer’s own published wording, cited on the product and on the roundup. The food-handling guidance is standard practice, not a shelf-life study. Prices come live from Amazon with the date attached.