How to Whip Cream

To whip cream, beat cold cream with at least 30 percent fat in a chilled bowl until it thickens into soft or medium peaks, adding a little icing sugar near the end. It takes 2 to 4 minutes with a mixer and about 5 by hand. Stop as soon as the peaks hold, because a minute too long turns it grainy and then into butter.

How cream turns into foam

Cream is an emulsion of tiny fat droplets suspended in water, each wrapped in a thin membrane. When cold, much of the fat inside each droplet is partly solid, made of tiny fat crystals.

Whipping does two things. It beats in air bubbles, and it knocks the fat droplets around so hard that their membranes tear. The partly solid fat droplets then stick to each other and to the surface of the air bubbles, forming a network that holds the bubbles in place. This is called partial coalescence.

The fat needs to be cold for this to work. Solid crystals let droplets stick without fully merging. Warm, liquid fat just smears together and the foam collapses.

Why fat percentage and temperature matter

You need enough fat droplets to build a continuous network around every bubble, which is why cream below about 30 percent fat won't whip. Canadian whipping cream (33–36 percent) and heavy cream (36 percent or more) both work; higher fat whips faster and holds longer.

Keep the cream below about 7 °C / 45 °F. Chill the bowl and whisk too, since a warm metal bowl heats a thin layer of cream to the point where its fat melts. On a hot day, set the bowl over another bowl of ice.

When to add sugar

Sugar dissolves in the water part of cream and doesn't interfere much with the fat network, but it can slow whipping slightly. Add it once the cream has started to thicken.

Icing sugar dissolves instantly and its small amount of cornstarch helps hold the foam. Use about 2 tablespoons (15 g) per cup (250 mL) of cream for a lightly sweet topping. Granulated sugar works too, but whip a little longer so it dissolves.

Peak stages

• Soft peaks. The cream holds its shape briefly, then the tips slump over. Best for folding into mousses and dolloping on pie.
• Medium peaks. Peaks stand with the tip curling over. Best for topping cakes and desserts.
• Stiff peaks. Peaks stand straight up. Use for piping, but this stage is seconds from overwhipped.
• Overwhipped. Grainy, curdled look, yellowish tinge. The fat network is collapsing into butter.

Steps

1. Chill the bowl and whisk in the fridge or freezer for 10 to 15 minutes. Metal holds cold best.
2. Pour in cold cream straight from the fridge. Use a bowl large enough that the cream fills it no more than a quarter of the way; it doubles in volume.
3. Whip on medium speed until the cream thickens and the whisk leaves trails. This takes about 1 to 2 minutes with a mixer. High speed is faster but gives you less control and larger, less stable bubbles.
4. Add icing sugar and vanilla. Roughly 2 tablespoons of icing sugar and 1/2 teaspoon of vanilla per 250 mL of cream.
5. Keep whipping until soft or medium peaks form. Check often by lifting the beaters.
6. Finish the last few strokes by hand to avoid overwhipping. Cream changes from medium to stiff to grainy very quickly at the end.
7. Use right away or refrigerate covered. Plain whipped cream holds for a few hours; if it slackens, rewhip briefly by hand.

Common mistakes and fixes

• Cream stays liquid. Too warm or too low in fat. Chill everything and check for at least 33 percent fat.
• Grainy, lumpy texture. Slightly overwhipped. Fold in 2 to 3 tablespoons of cold liquid cream by hand.
• Separated into butter and buttermilk. Fully overwhipped. Keep whipping, drain off the liquid and use the butter.
• Whipped cream weeps on the cake. It wasn't stabilized. Add mascarpone, skim milk powder or gelatin for desserts that need to hold.
• Big, loose bubbles. Whipped on high from the start. Use medium speed for a finer, sturdier foam.

Make-ahead and stabilized cream

For a topping that holds overnight, whip in 2 tablespoons (30 g) of mascarpone per 250 mL of cream, or 1 tablespoon of skim milk powder, which adds protein to strengthen the foam. For piped decorations, sprinkle 1/2 teaspoon of gelatin over 1 tablespoon of cold water, let it bloom, melt it gently, cool slightly and whisk it in at soft peaks.