December 17, 2025, 4:29 am | Read time: 4 minutes
Baking cookies is a cherished tradition for many during the holiday season. However, despite the festive spirit, common mistakes can occur during baking that may affect the outcome. Often, these issues stem from small oversights when handling the oven, which can be easily avoided. myHOMEBOOK highlights five pitfalls in cookie baking and explains how to achieve perfect results with simple measures.
1. Mistake: Relying Blindly on the Recipe’s Temperature
Many recipes specify a temperature without clarifying whether it’s meant for convection or conventional heat. This can lead to misunderstandings, as the two modes operate differently. For instance, if 180 degrees is specified, it usually refers to conventional heat. Using the same temperature with convection can cause the cookies to brown too quickly or dry out, as convection is more intense and distributes heat more evenly in the oven.
If a clear indication is missing, a simple rule of thumb helps: The convection temperature is usually about 20 degrees lower than for conventional heat. This means 180 degrees of conventional heat roughly corresponds to 160 degrees of convection. Following this guideline helps avoid common baking errors due to unclear temperature specifications. This makes a noticeable difference in the outcome, especially for cookies that are sensitive to heat.
2. Mistake: Curious Peeks
When checking the baking progress, the baking sheet is often pulled out of the oven a bit. However, if it’s pulled out too far, a lot of hot air escapes from the oven quickly. This sudden loss of temperature can affect the entire baking process, especially for small baked goods like cookies that only need a few minutes. The oven then takes some time to regain the lost heat, causing the cookies to bake unevenly.
Additionally, the abrupt cooling can cause delicate varieties to dry out faster or change shape. In some cases, the baking time is extended, while in others, some areas become too dark, while others are not yet done. It’s usually sufficient to open the door briefly and pull the sheet slightly without removing it completely from the warm area. This keeps the temperature more stable, resulting in a more even outcome.
3. Mistake: Not Preheating the Oven or Preheating It Too Briefly
A common mistake in cookie baking is not preheating the oven at all or only inadequately. Many recipes assume that the specified temperature is already stable when the first sheet goes into the oven. If the dough is placed in an oven that is not fully preheated, the cookies warm up more slowly and under different conditions than intended. The result can be spread-out, flat, or unevenly baked cookies.
The Easiest Recipe for Grandma-Style Cookies
11 Common Mistakes With Air Fryers
4. Mistake: Impatience While Baking
When baking multiple sheets in succession, it’s tempting to reuse the already used baking sheet immediately. However, if it’s still hot, it can lead to undesirable effects. The dough begins to melt on the sheet before it even goes into the oven. This is especially true for shortcrust or cut-out cookies, causing the contours to blur and the cookies to spread. Instead of neat shapes, flatter, unevenly baked goods result.
Moreover, a hot sheet alters the baking process: The bottom of the cookies gets an immediate heat boost, while the top only comes into contact with the oven temperature. This can lead to uneven browning and overly crispy or even too dark bottoms, while the surface remains relatively light. In some cases, this changes the effective baking time, making it harder to judge when the cookies are actually done.
5. Mistake: Not Keeping the Oven Clean
A common, often underestimated mistake is not thoroughly cleaning the oven over time. Baking and roasting leave residues of fat, sugar, dough, or other foods on the bottom, walls, and sheets. These residues burn again with each use, producing smoke, odors, and sometimes even small soot particles. Such effects can directly impact the baking result—even if they don’t seem visible at first glance.
Burnt residues often cause certain areas in the oven to heat more than others. This creates so-called hotspots, or zones with elevated temperatures. Cookies placed in these spots brown faster, dry out, or, in the worst case, become too dark, while others on the same sheet are not fully baked. This disrupts the even heat distribution crucial for perfectly baked cookies.