Why do cookies burn on different cookie sheets?

Cookies burning on different cookie sheets can be due to a few factors:

1. Material:

* Metal: Aluminum sheets tend to heat up quickly and evenly, which is great for cookies. However, they can also cause scorching if the oven temperature is too high or if cookies are left in too long.

* Non-stick: These sheets often have a coating that can prevent cookies from sticking, but the coating can also burn or release chemicals if exposed to high heat for extended periods.

* Dark: Darker-colored cookie sheets absorb more heat, making them prone to burning cookies.

2. Thickness:

* Thin sheets: Thin sheets heat up faster, increasing the risk of burning, especially if the oven temperature is not properly calibrated.

* Thick sheets: Thicker sheets distribute heat more evenly, reducing the chance of burning. However, they might take longer to reach the desired temperature.

3. Condition of the Sheet:

* Warped or scratched: Warped or scratched sheets create uneven heat distribution, leading to burnt edges or centers.

* Dirty or greasy: Residual grease and grime can cause scorching and uneven browning.

4. Oven Temperature and Baking Time:

* Overheating: If the oven temperature is too high, cookies will burn quickly.

* Overbaking: Leaving cookies in the oven too long can result in burning, regardless of the cookie sheet.

5. Cookie Recipe:

* Sugar content: Cookies with high sugar content can burn more easily due to their caramelization process.

* Fat content: Cookies with less fat may be more susceptible to burning, as they tend to dry out faster.

Tips to Prevent Cookie Burning:

* Use a good quality, even-heating cookie sheet.

* Preheat the oven accurately and use a thermometer to verify the temperature.

* Avoid overcrowding the cookie sheet.

* Check cookies frequently and rotate the sheet halfway through baking.

* Remove cookies from the oven when they are golden brown and set.

In short, there are many reasons why cookies might burn on different cookie sheets. By understanding these factors and following the tips above, you can bake delicious, evenly browned cookies every time.