Finding the cause in order
Cookies have few ingredients, so small differences show up plainly. When a batch fails, rather than overhauling the recipe, look at the symptom first and suspect measuring, then ingredient temperature, then the oven, and you will find the cause quickly. If you measured flour by the cup, a weight difference is the most likely culprit. Next look at butter and dough temperature, and finally at the oven's real temperature and the tray position. When you bake again, change only one thing so you know what made the difference. Test-baking just a few cookies first is also a good idea.
- Measuring: were flour and sugar weighed?
- Temperature: were butter and dough as the recipe said?
- Oven: were the real temperature and rack right?
When they spread too thin
If cookies flatten out with thin edges and run into each other, the dough melted before it could set in the oven. The usual causes are butter that was too soft or melted, dough that went in warm, or an oven that was not hot enough. Too much sugar or too little flour also causes spreading. Chill the dough for at least 30 minutes before baking, and when loading the next batch, cool the hot tray or use another one. Greasing the tray makes cookies slide and spread more, so parchment is the better choice.
When they stay thick and do not spread
If cookies keep the shape of the dough ball and seem underdone inside, it is the opposite situation. You may have packed flour into the cup and used too much, chilled the dough so long that it turned rock hard, or baked so hot that the outside set first. If the dough is so dry it barely holds together, reweigh the flour. Press chilled dough lightly with your palm once it is on the tray to even out the thickness so it bakes evenly. Also check whether the recipe actually intends a thick cookie.
When bottoms burn or color is uneven
Pale tops with burnt bottoms mean too much heat from below. Dark trays absorb a lot of heat and brown bottoms quickly, so lower the temperature slightly or shorten the time. If you were baking on the low rack, move to the middle, and stacking two trays softens the heat reaching the bottom. If cookies at the back of the tray are darker, the oven heats unevenly, so turn the tray front to back midway. If cookies vary in size, the small ones burn first, so divide the dough by weight.
- Dark trays: lower the heat slightly or shorten the time
- Move to the middle rack or stack two trays
- Turn the tray midway and keep pieces the same size
When they are hard and dry
If cooled cookies are hard enough to hurt your teeth, they were usually baked too long or lack ingredients that hold moisture. Cookies keep cooking from the heat of the tray after they leave the oven, so if you wait until they look fully firm in the oven, they end up too hard once cool. More flour or a higher share of white sugar makes them crisper and harder, while more brown sugar tilts them toward moist and chewy. Overworking the dough develops gluten and also makes them tough, so once the flour goes in, mix only until no dry flour shows.
When to take them out
Many cookies are best pulled when the edges are golden and set but the centers still look slightly soft. Left on the tray for a few minutes, the centers finish cooking from the remaining heat and firm up; then move them to a rack to let steam escape from the bottom. With a new recipe, look through the oven window 2 or 3 minutes before the stated time, and note when you took them out and how they turned out, so next time you can use the right time for your oven straight away. If your timer can run several countdowns, set one for turning the tray and one for taking it out.
Handling the dough
Resting dough in the fridge firms the butter again so it spreads less, and lets the flour absorb moisture, which tends to even out flavor and color. Dividing dough into equal weights makes the bake more even across a tray. Leave enough space between cookies for them to spread. If you do not need to bake everything at once, you can shape and freeze the dough and bake it when needed, though it may take a little longer than the recipe says.
Storage and safety
Store fully cooled cookies in an airtight container so they neither go soft nor dry out. Crisp and soft cookies in the same tin trade moisture and both change texture, so keep them apart. It is safer not to taste dough that contains raw egg and uncooked flour. Use dry oven gloves when taking out or turning trays, and set hot trays down out of reach. When sharing cookies with nuts, chocolate, milk or eggs, list the ingredients for anyone with allergies.
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