Thank you Sis for all this info that you posted here ! That was the problem that I was having with the cookies. Every time that I would set the timer for the right time for them to be in the oven, I would smell them baking but it was a burnt smell. I would check them and sure enough, they would be to brown ! And black spots on the bottom like you say.
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.
I know that 5 degrees lower is not enough--here is what I found when I had dark cookie sheets:
Dark Cookie Sheets
Dark cookie sheets often brown the bottoms of cookies too quickly, leaving them with blackened undersides and overly crispy edges. This is because the sheets' dark color absorbs the oven's heat; these sheets grow much hotter than their aluminum counterparts do. "The Baker's Dozen Cookbook" discourages baking cookies on dark cookie sheets, if you have the choice. However, if they are the only baking sheets available, lower the oven temperature by 25 degrees Fahrenheit and keep an eye on the cookies while they bake to keep them from burning.
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