Here are how cookie sheets affect your cookies:
Aluminum Cookie Sheets--heavy-duty aluminum cookie sheets are the best sheets to choose when making any cookie. The reflective material allows the cookies to bake evenly without burning on the bottom. This is because thick aluminum conducts heat better than most other types of metal. If you use aluminum cookie sheets, line the sheets with parchment paper or a silicone baking mat to keep the cookies from sticking.
Air-Cushioned Cookie Sheets--Air-cushioned insulated cookie sheets generally yield cookies that are soft and light in color. They rarely burn the cookies and don't require parchment paper or a silicone mat to keep baked cookies from sticking. "Cookies for Dummies," points out that cookies baked on air-cushioned insulated cookie sheets often come out doughy in the center and can take longer to cook all the way through. Insulated cookie sheets are not desirable for cookies that should be crisp on the bottom, and you should expect to extend the baking time by at least a couple minutes if you use them.
Nonstick Cookie Sheets--don't require greasing or lining, which makes them a more convenient than other types. However, they may be a poor choice for cookies that should be thin and crispy. Nonstick cookie sheets don't allow dough to spread as much as cookie sheets that have been greased do; this results in a more rounded, cake-like cookie.
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