Cheesecake is one of the friendliest bakes for sugar replacement. A sponge depends on sugar for creaming, moisture and browning; a baked cheesecake gets its structure almost entirely from eggs and cream cheese. Sugar plays a supporting role, sweetening the custard and keeping it tender. Swap it out and you keep the tenderness while losing the sugar.
Erythritol is what makes this possible. It is roughly 70 per cent as sweet as caster sugar, it does not caramelise or brown, and it dissolves cleanly in a wet batter. That last point matters enormously. In a dry biscuit or a meringue, erythritol can feel gritty; in a dense, creamy cheesecake it vanishes completely, leaving nothing but smooth vanilla custard behind.
The finished bake looks and tastes like the classic — a pale-gold top, a dense but creamy interior, and no toothache afterwards. It is special enough to end a birthday dinner, a Christmas table or an anniversary supper, and nobody will guess it is sugar-free.
Buy full-fat everything. Reduced-fat cream cheese is more watery and sets to a rubbery texture, and the fat is doing structural work here. Take the cream cheese and eggs out of the fridge an hour before you start.
Powder your erythritol before you begin. A quick blitz in a small blender or spice grinder turns the crystals into icing-sugar fineness, which dissolves far more readily and removes any risk of a crunch. If you have a blend containing allulose or a little inulin, so much the better — it stays softer when chilled. Keep erythritol well away from dogs and cats, and go easy on portion size, as large amounts can be unsettling for sensitive stomachs.
Blitz the biscuits to fine crumbs, or use ground almonds for a naturally lower-carb base. Stir in the melted butter, the powdered erythritol and the salt until the mixture looks like damp sand. Tip it into the tin and press it down firmly with the flat base of a glass, working it slightly up the sides.
Chill the tin in the fridge for 20 minutes while you make the filling. This firm base stops crumbs floating up into the batter and gives the cheesecake a clean slice.
Beat the cream cheese on its own first, on a low speed, just until smooth. Add the erythritol and beat briefly again. Then add the sour cream, cornflour, vanilla and salt, and mix until combined.
Add the eggs one at a time, mixing on the lowest speed and stopping the moment each one disappears. This is the single most important step: over-whisking whips air into the batter, and air is what makes a cheesecake puff, crack and sink. You want a glossy, pourable custard, not a mousse.
Scrape down the bowl, give it one final gentle stir by hand, then pour it over the chilled base and smooth the top with a spatula.
Heat the oven to 160°C fan, 180°C conventional, gas mark 4. Set the tin inside a deep roasting tin and pour boiling water into the outer tin to come about 2cm up the sides — wrap the springform in two layers of foil first if it is not watertight. This water bath keeps the custard gentle and dramatically reduces cracking. If that feels like too much fuss, simply place a roasting tin of hot water on the shelf below.
Bake for 50 to 60 minutes. The edges should be set and slightly puffed, while the centre still wobbles like a set jelly when you nudge the tin. A digital thermometer in the middle should read 68 to 70°C.
Now be patient. Turn the oven off, prop the door open with a wooden spoon, and leave the cheesecake inside for a full hour. Then bring it to room temperature for another hour before chilling.
Chill it uncovered for an hour to firm the surface, then cover and refrigerate overnight. No gelatine is needed: the eggs set the custard and the butterfat firms up in the cold, giving you a clean, creamy slice by morning.
Once you have the base recipe nailed, play with it. Fold through a swirl of sugar-free raspberry jam for a ripple, add the grated zest of an orange with a pinch of ground cardamom, or swap the vanilla for 2 tsp of espresso powder dissolved in a tablespoon of hot water.
To serve, run a hot knife around the edge, release the springform and slice with a knife wiped clean between cuts. A 20cm cheesecake serves 10 to 12 generous portions. Pair it with fresh raspberries, a spoonful of sugar-free berry coulis, or softly whipped double cream sweetened with a little powdered erythritol and vanilla.
It keeps beautifully covered in the fridge for up to four days. For longer storage, slice it first, wrap each piece in cling film and freeze for up to two months — thaw overnight in the fridge and it will taste as good as the day it was baked.
Sugar-Free Design shares practical, down-to-earth guidance on sugar-free baking and low-sugar dessert recipes for uk homes for readers across the UK.
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