A step-by-step method for shrinking a full-size baking recipe: find the factor, convert to grams, sort out eggs and pans, then test.
You have a favourite recipe that makes 24 cookies or a cake for ten. You want four cookies or a cake for two. Dividing everything by six on the back of an envelope rarely works first time. Here is a method that does, in six steps.
Step 1: Pick your target yield
Decide how many servings you actually want. Then divide that by the original yield. Wanting 4 cookies from a recipe for 24 gives a factor of one sixth. Write the factor down; you will use it for every ingredient.
Step 2: Convert everything to grams
Cups and spoons get awkward fast. A sixth of a cup of flour is hard to measure; 20 grams is easy. Convert the full recipe to grams first, using the weight charts printed on your flour and sugar packets or a reliable conversion table. Then multiply each weight by your factor.
Step 3: Deal with the eggs
Eggs are the usual sticking point. Weigh a beaten egg and use the scaled amount by weight. If the maths gives you a tiny quantity, say 8 grams, round to the nearest sensible amount, or swap in a yolk for richness or a splash of milk for moisture. Our guide to halving an egg covers the details.
Step 4: Be careful with leavening and salt
Baking powder, baking soda, yeast and salt are used in small amounts to begin with. Scaled down, they can become a pinch. Measure them with a precise spoon set or a scale that reads tenths of a gram if you have one. Too much leavening in a small batch tastes bitter and can make the bake rise and collapse.
Step 5: Match the pan
The goal is the same depth of batter as the original. If the full recipe filled a 20 cm square tin to 3 cm deep, look for a small pan your scaled batter fills to about the same depth. Ramekins and mini loaf tins are your friends. See which pans to own.
Step 6: Watch, don’t time
Keep the oven temperature the same. Start checking at about two thirds of the original baking time and use visual cues: a clean skewer, a springy top, golden edges. Write down the time that worked for next time. More on this in how baking time changes.
A worked example
Take a muffin recipe for 12. You want 2, so the factor is one sixth. Convert flour, sugar, butter and milk to grams and divide by six. The recipe uses two eggs; a sixth of two eggs is a third of an egg, roughly 17 grams of beaten egg. The teaspoon of baking powder becomes a little under a quarter teaspoon. Bake in two cups of a muffin tray, with water in two empty cups beside them, and start checking well before the full time.
When to stop scaling
Some recipes resist shrinking. Delicate sponges that rely on whipped whole eggs, and enriched breads that need a large mass of dough to knead well, can struggle at very small sizes. For those, make a half batch and freeze the extra portions.
Prefer recipes already built small? Browse the small-batch recipes.