How do I cream butter and sugar properly?

The mechanism is worth knowing because it tells you what can go wrong. Sugar crystals are sharp. Beaten through soft butter they cut through it, and each cut leaves a tiny pocket of air behind. Those pockets are the sites that the raising agent later inflates and the heat expands. Fridge-cold butter is too hard for the crystals to cut; half-melted butter is too fluid to hold the pocket open. Both leave you with a dense cake for the same underlying reason. The drawing shows the mixture at one, three and five minutes with a magnified inset of the fat at each stage.

What you'll need

• Butter at cool room temperature
• Caster sugar
• An electric hand mixer or a stand mixer (optional)

Step by step

1. Get the butter to the right firmness first.It should take a finger dent easily but still hold its shape and look matte. Cut it into small cubes and give it thirty to sixty minutes out of the fridge. Never microwave it to a puddle — see `room-temperature-baking-ingredients` for faster methods that work.
2. Use caster sugar unless the recipe says otherwise.Fine crystals give more cutting edges per spoonful than granulated, so caster aerates better. Icing sugar has no crystals at all and barely aerates. Soft brown sugar works but the mixture stays darker so the colour signal is less useful.
3. Beat the butter alone for thirty seconds first.It smooths out and warms very slightly, so the sugar disperses evenly rather than sitting in pockets.
4. Add the sugar and beat, scraping the bowl twice.Fat clings to the sides and the bottom of the bowl and never sees the beater. Stop twice, scrape everything down with a spatula, and carry on. Unscraped bowls are the commonest reason creaming looks unfinished.
5. Judge by colour and volume, not by minutes.You are looking for three changes together: paler — from butter-yellow towards near-white; matte rather than glossy; and visibly more of it in the bowl. A little lifted on the beater should hold a soft peak.
6. Stop before it warms up.Long beating warms the fat, particularly in a stand mixer in a warm kitchen. Butter that starts to look shiny or slumps at the edge of the bowl has gone past the point and will hold less air, not more.

Tips

• There is such a thing as over-creaming in a stand mixer left running: the mixture warms, the cells coalesce, and the cake can rise fast and then sink. Watch it rather than timing it.
• Creaming by hand works perfectly well — a wooden spoon against the side of a bowl, roughly ten minutes. It is how every cake was made before electric mixers.
• Vegan blocks and baking spreads cream differently; firm block-style vegan butter behaves closest to dairy butter. See `baking-spread-instead-of-butter`.
• The all-in-one method skips creaming entirely and compensates with extra baking powder and very soft fat. It is a legitimate technique, not a shortcut to be ashamed of.

Common mistakes

• Starting with butter straight from the fridge and turning the mixer up — Speed does not soften butter fast enough. You get splattered sugar, a hot motor and a lumpy mixture that never aerates.
• Not scraping the bowl — A third of the mixture can sit untouched on the sides. The scraped-in lumps then never aerate and show up as dense streaks in the crumb.

If it doesn't work