Dairy substitutions in baking: milk, cream, yoghurt and buttermilk
Key takeaways
- Every dairy swap moves two dials: fat and acidity. Name both before swapping.
- Buttermilk ⇄ thinned yoghurt is baking’s most reliable dairy swap.
- Cream’s fat is structural in ganache and whipping — milk cannot understudy it.
- Make buttermilk in ten minutes with milk and lemon juice.
Dairy is where recipes meet the reality of the fridge: the recipe wants buttermilk, the fridge offers yoghurt; the sauce wants double cream, the shelf has single. Dairy substitutions mostly work — milk, cream, yoghurt and their cultured cousins are one family at different fat levels — but each swap changes fat, water and acidity in a specific direction, and knowing the direction turns a rescue into a recipe.
This article maps the family: what each dairy brings to a bake, the swaps that are arithmetically sound, the ones that need a small companion adjustment, and the few (whipped cream for buttercream, say) that are not swaps at all but different desserts.
The family, by fat and acidity
Milk is the baseline: about 87% water, 3.5–4% fat, gentle and neutral. Creams climb the fat ladder — single at about 18%, whipping at 35%, double at 48% — trading water for richness as they go. The cultured branch — buttermilk, yoghurt, sour cream, crème fraîche — adds acidity, which is not a flavour footnote in baking: acid tenderises gluten, reacts with soda, and sets the tang that certain bakes (scones, soda breads, red velvets) are built around.
Every substitution in this article is some combination of moving the fat dial and the acid dial. A swap that moves one dial must sometimes nudge the other back: yoghurt for milk adds acid and thickness; cream for milk adds fat and removes water. Naming what moved is the whole skill.
Swaps that need nothing else
Whole milk and semi-skimmed exchange freely in batters and doughs — the fat difference is small at recipe scale, and only the richest custards notice. Buttermilk and thinned yoghurt are near-interchangeable: natural yoghurt loosened with a splash of milk to pouring consistency matches buttermilk's role and acidity in scones, pancakes and soda breads. Sour cream and crème fraîche swap in bakes where their fat is similar, and Greek yoghurt with a spoon of milk stands in for sour cream in most cakes.
Evaporated milk, diluted half and half with water, is milk for all baking purposes. Sweetened condensed milk is not — it arrives pre-sweetened, and using it means removing most of the recipe's sugar and accepting its caramelised flavour as a feature.
One more member of the family deserves its line: evaporated and powdered milks, the store-cupboard dairies. Evaporated milk is milk with half its water removed, so it dilutes back one-to-one with water for any baking purpose, and undiluted it enriches like a light cream in sauces and fudges. Milk powder is the traveller's and the bread baker's friend — a tablespoon whisked into the flour of a loaf adds the proteins and sugars of milk (softness, browning) without touching the dough's hydration sums, which is precisely why professional sandwich-loaf formulas use it. Both keep for months, and between them they mean a dairy emergency in baking is rarer than the empty fridge suggests.
Swaps that need a companion adjustment
Cream for milk in a cake or sauce: the fat jumps, so expect a richer, denser result, and consider thinning cream with a little milk rather than swapping all of it — half cream, half milk approximates the intended richness in most batters. Milk for cream in a ganache or a sauce will not set or coat the same way; the fat is the structure, and the honest fix is a recipe designed for milk, or a cornflour-thickened sauce that admits what it is.
Plant milks swap into batters by volume, usually gracefully — oat and soy behave closest to dairy milk — but they bring no casein for structure in custards and less fat, so rich bakes come out leaner; adding a tablespoon of oil per 250 ml restores some of what the swap removed. Coconut cream is its own ingredient: high fat, assertive flavour, splendid where welcome.
When there is no substitute
Buttercream needs butter's solidity; no dairy liquid whips into its structure, and the answer to ‘no butter’ is a different frosting — a ganache, a glaze — chosen honestly. Whipped cream needs cream of whipping fat content (about 35%+); milk will not whip with any amount of optimism. Custards set by egg protein in a dairy bath; swap the dairy and you can still succeed, but swap away the richness entirely and the custard becomes a sauce with ambitions.
Knowing the unsplittable cases saves the most grief. Baking substitutions fail not because cooks are careless but because nobody told them which properties were load-bearing. In dairy, the load-bearing properties are fat percentage, acidity and protein — in that order, for most bakes.
| Have | Recipe wants | Verdict |
|---|---|---|
| Natural yoghurt + splash of milk | Buttermilk | Swap freely — acidity and thickness match |
| Half cream, half milk | Whole milk (rich batter) | Close — richer than intended, pleasantly |
| Semi-skimmed milk | Whole milk | Swap freely in batters and doughs |
| Oat milk + 1 tbsp oil / 250 ml | Milk | Good in cakes; leaner custards |
| Sweetened condensed | Milk | Only with sugar removed — different bake |
| Milk | Double cream (ganache) | No — fat is the structure |
Dairy swaps at a glance
Scones with yoghurt, on purpose
A scone recipe wants 150 ml of buttermilk for its acid-and-soda lift. The fridge holds natural yoghurt. Thinned with two tablespoons of milk, the yoghurt matches buttermilk's consistency and acidity, the soda reacts identically, and the scones rise on the same chemistry. The swap succeeds because it was understood — acid for acid, thickness for thickness. The same yoghurt, swapped for cream in a pour-over sauce, would fail for the opposite reason: there, fat was the point, and yoghurt has hardly any.
Common mistakes
Swapping sweetened condensed milk for milk. It is a sugar syrup wearing a dairy name. Unsweetened evaporated milk is the tinned substitute; condensed changes the whole recipe’s sweetness.
Expecting milk to whip or set like cream. Whipping and ganache-setting are fat structures. Below whipping-cream fat, no technique substitutes for the missing percentage.
Ignoring acidity when swapping cultured dairy. Plain milk in place of buttermilk in a soda recipe removes the soda’s partner. Add a teaspoon of lemon juice per 250 ml and wait five minutes.
Questions, answered
Can I make buttermilk at home?
Yes: stir a tablespoon of lemon juice or vinegar into 250 ml of milk and rest it ten minutes. It thickens and acidifies — functionally buttermilk for baking.
What is the best plant milk for cakes?
Oat and soy track dairy milk most closely in batters. Almond is thinner and leaner; coconut brings its flavour along, welcome or not.
My recipe wants clotted cream. Substitutes?
For serving, mascarpone loosened with a little cream is the nearest texture. For baking inside a recipe, double cream plus a knob of butter approximates its richness.
The short version
Dairy substitutions stop being folklore once you see the family clearly: one ingredient at many fat levels, in plain and cultured forms. Match the fat, match the acid, adjust the thickness — and the fridge you have becomes the ingredient list the recipe wanted.
Put it into practice
The tool this article leans on: Liquid Volume Converter — Millilitres, litres, cups, spoons and fluid ounces, converted. Open it alongside “Dairy substitutions in baking: milk, cream, yoghurt and buttermilk” and run the numbers for your own bake.
Open the Liquid Volume Converter →