When doubling a recipe and splitting it into two pans, the cooking time for each pan might be slightly shorter than the original single batch. This is because the batter or dough is spread thinner, allowing heat to penetrate more quickly.
When you double a recipe but divide it into two separate pans instead of using one larger pan, you're essentially changing the geometry of the cooking process. Here's a breakdown of why the cooking time might differ:
Surface Area to Volume Ratio: Smaller pans have a higher surface area to volume ratio compared to a single large pan containing the same total volume. This means more of the batter or dough is exposed to the heat of the oven at any given time.
Heat Penetration: With a thinner layer of batter or dough in each pan, the heat doesn't have to travel as far to reach the center. This results in faster and more even cooking.
Moisture Evaporation: The increased surface area also allows for more moisture to evaporate during baking. This can lead to a slightly drier, but potentially crispier, final product and can contribute to a faster cooking time.
Oven Dynamics: The presence of two smaller pans might slightly alter the airflow and heat distribution within the oven compared to a single large pan. This effect is usually minimal but can contribute to subtle differences in cooking time.
In some cases, the cooking time can be noticeably faster. For example, if you're baking a cake, splitting the batter into two thinner layers will significantly reduce the baking time compared to baking one thick cake.
Always start checking for doneness a few minutes earlier than the original recipe suggests when using smaller pans. Use a toothpick or cake tester to check the center for doneness and prevent overbaking.