When using silicone bakeware do you have to place it on a cookie sheet before baking?

You generally don't need to place silicone bakeware on a cookie sheet before baking. Here's why:

* Silicone is heat-resistant: Silicone bakeware is designed to withstand high temperatures, so it won't melt or warp in the oven.

* It's flexible: The flexibility of silicone allows it to easily move around on the oven rack without needing extra support.

* No sticking: Silicone is naturally non-stick, so your baked goods will release easily without the need for greasing.

However, there are a few exceptions:

* Very large or heavy recipes: If you're baking a very large or heavy cake or loaf, the silicone pan may be too flimsy to support its weight. In this case, placing it on a cookie sheet can help prevent it from sagging.

* Recipes that require browning: Some recipes, like cookies, require browning on the bottom. Because silicone is a poor heat conductor, the bottoms of your cookies might not brown as much as they would in a metal pan. Placing the silicone pan on a cookie sheet will help transfer more heat to the bottom and encourage browning.

* Oven type: If you have a very old or unreliable oven, the heat distribution may be uneven. Placing the silicone pan on a cookie sheet can help ensure more consistent heating.

Ultimately, the best way to determine if you need to use a cookie sheet with your silicone bakeware is to check the manufacturer's instructions. They will usually specify if it's necessary for certain recipes or oven types.