| Butter |
Butter changes whether the butter's own water reaches the flour, which decides chewy against cakey before the oven is involved. | recipes vary this |
| Sugar |
More sugar ties up water the flour would otherwise use, so the dough spreads further and bakes crisper. | recipes vary this |
| Brown sugar |
More brown sugar holds water in the crumb, so it eats chewier and stays soft longer. | recipes vary this |
| Egg |
More egg sets the crumb sooner, so the middle finishes firmer and holds its shape. | recipes vary this |
| Leavening |
More leavening lifts the cookie and shifts its pH, which moves both how far it rises and how dark it gets. | recipes vary this |
| Salt |
More salt changes how sweet the cookie reads, without changing how much sugar is in it. | recipes vary this |
| Added liquid |
More added liquid builds more gluten, so the cookie pulls when you bite it instead of crumbling. | recipes vary this |
| Chocolate |
A bigger chocolate keeps its centre underdone while the edge sets, widening the gap between the two. | recipes vary this |
| Flour protein |
More flour protein builds more gluten, so the cookie pulls when you bite it instead of crumbling. | recipes vary this |
| Portion |
A bigger portion keeps its centre underdone while the edge sets, widening the gap between the two. | recipes vary this |
| Cornstarch |
More cornstarch dilutes the protein, giving a softer set and less spread. | settled · everyone agrees |
| Acid |
More acid lifts the cookie and shifts its pH, which moves both how far it rises and how dark it gets. | settled · everyone agrees |
| Shortening |
Shortening changes whether the butter's own water reaches the flour, which decides chewy against cakey before the oven is involved. | settled · everyone agrees |