When you double a recipe, the baking time may not be exactly doubled. The baking time can be affected by various factors, including the size of the baking dish, the thickness of the batter or dough, and the efficiency of your oven. As a result, the baking time may increase, but it might not be precisely twice as long as the original recipe.
Here are some considerations when doubling a recipe and adjusting the baking time:
Increased volume: When you double a recipe, you will have more batter or dough to bake. If you use a larger baking dish or pan to accommodate the increased volume, the baking time may remain relatively similar to the original recipe. However, if you use the same-sized dish, the increased depth of the batter or dough may require a longer baking time.
Oven temperature: It's essential to maintain the same oven temperature as specified in the original recipe. Changes in temperature can significantly affect the baking time and the final outcome of the cake or baked goods.
Visual cues: Rely on visual cues in addition to the recommended baking time. Check for the appropriate color and texture of the cake or baked goods. Use the toothpick or knife test to check if the center is cooked and no longer gooey.
Oven performance: Different ovens can vary in their performance, so it's essential to know your oven's behavior. Some ovens may distribute heat more evenly, while others may have hot spots. Keep an eye on the baking process and be prepared to make adjustments as needed.
Practice and experience: With experience, you'll become better at estimating the adjusted baking time when doubling recipes. Note any changes you make and their outcomes to help you with future baking endeavors.
As a general guideline, start by adding 5 to 15 minutes to the original baking time when doubling a recipe. Then, monitor the baking process closely and make further adjustments as needed based on visual cues and the toothpick/knife test. Remember that it's always better to slightly underbake and check for doneness rather than overbake, as overbaking can lead to dry or burnt results.
Keep in mind that certain baked goods, such as cookies or smaller cakes, might require less adjustment to the baking time compared to larger cakes or bread loaves. Always refer to the recipe and your own baking experiences as a starting point for adjusting the baking time when doubling a recipe.