Baking Science
Why your cookies turn out different every time
Ingredient quantities, butter temperature and oven conditions can all change your cookies. Check each separately to find the cause.
3 min read
By Stefan Ulrich · Last updated
The problem with cups
A measuring cup measures volume. Check its marked capacity: US cups and metric cups are not the same size.
The flour reference on this site is 120 g per US cup. A more tightly filled cup can contain more flour and change the dough.
Cocoa, powdered sugar and almond flour also need their own measuring instructions. Do not assume that all powders vary by the same percentage.
How technique changes the number
To compare your own technique, tare a scale and record the flour weight for each method below. These are instructions for your experiment, not results of tests performed by this site.
- Scooped directly from the bag — the cup packs tightly
- Spooned gently and levelled — the standard method
- Sifted first, then spooned — very light
Compare the recorded weights while keeping the flour and cup unchanged. This isolates filling technique; it does not rule out oven temperature, ingredient differences or altitude.
Sticky and liquid ingredients have the same problem
The site uses 340 g per cup for honey, 313 g for maple syrup and 227 g for butter. These are ingredient references, not interchangeable cup weights.
Sticky ingredients such as honey and peanut butter may leave residue in the cup. How much reaches the bowl depends on the product and how thoroughly you scrape the measure.
Control the quantities
For gram quantities, tare a bowl and add each ingredient to its target weight. For small spoon quantities, use measuring spoons or a scale with suitable resolution.
Weighing makes the amount repeatable. It does not control butter softness, dough temperature or baking time.
When weighing, packing the sugar no longer determines its amount. Still follow instructions such as sifting cocoa to remove lumps or softening butter for mixing.
Converting cup recipes to grams
Save converted weights with the recipe, including the ingredient form and the reference used. Prefer gram quantities supplied by the recipe author.
The ingredient pages provide reference weights, source notes and converters. Start with the ingredients you use most:
- → All-Purpose Flour — 1 cup = 120 g
- → Granulated Sugar — 1 cup = 200 g
- → Butter — 1 cup = 227 g
- → Brown Sugar — 1 cup = 220 g
- → Cocoa Powder — 1 cup = 85 g
- → Honey — 1 cup = 340 g
The takeaway
Check quantities, butter temperature, chilling and actual oven temperature. Change one factor at a time and note the result; weighing addresses only the quantity part.
Sources and ingredient references
The linked ingredient pages explain the reference weights used here, including source differences. Conversions are estimates; the original recipe’s gram quantities take priority.