You want six muffins, but the recipe makes twelve and calls for one egg. Flour and sugar are easy to halve. The egg is where an otherwise careful baker may start guessing—and where a small batch can become less predictable.
Write the reduced quantities before cracking anything. Working from a full recipe while doing mental arithmetic over the mixing bowl invites one unchanged ingredient to slip through.
Use the recipe’s original measurements
If reliable gram weights are provided, scale those weights directly. Keep the same conversion factor for every ingredient. For half a recipe, multiply by 0.5; for three quarters, multiply by 0.75. Do not mix an approximate cup conversion for one ingredient with the recipe’s tested weight for another.
King Arthur Baking’s recipe-reduction guide recommends weighing to divide eggs accurately. For a whole egg that will be mixed into the batter, beat it until the white and yolk are combined, weigh the usable mixture without the shell, and take the required fraction.
For example, if your beaten egg weighs 52 grams, half is 26 grams. That is an illustration based on a measured egg, not a claim that every egg weighs the same. If the recipe separates whites and yolks, scale them separately and preserve the specified method.
Small quantities deserve a second look
Check whether your scale reliably measures the small amount involved. A kitchen scale that rounds to whole grams may be unsuitable for a tiny quantity of leavener. Use appropriate measuring spoons or choose a tested small-batch recipe when the reduced quantity is impractical.
Put a tick beside each ingredient as it enters the bowl. This is especially useful when the original and reduced figures appear on the same page. Keep raw egg refrigerated when it is not being used, and follow local food-safety guidance for any remainder.
Do not halve the baking time automatically
Six muffins of the original size may bake differently from one shallow cake made with half the batter. Pan dimensions, batter depth and portion size still matter. Follow the recipe’s doneness cues and check appropriately, rather than dividing the timer by two.
Record the quantities, pan and result once. The next small batch can then begin with a usable recipe instead of another round of arithmetic.