Why does the bottom get burned?

[asitshouldbe]

Turn the oven down.

[gentlearts]

I would turn the oven down to 350 and definitely use parchment paper.

[tpk-nyc]

Food continues cooking after it comes out of the oven. All cookies should be taken out while they're slightly underdone. Another trick is to portion the cookies but then chill them before baking. A lot of bakeries do this because it allows the cookies to "set" while baking without melting and spreading too thin. It's particularly useful for chocolate chip cookies if you want them chewy rather than crispy.

[eggalegga]

Originally Posted by SATX56

We use insulated sheet pans and parchment paper. Pull them out just before fully cooked (still a little mushy in center) let them sit on pan to finish. Slide off pan with parchment paper. Never get burnt bottoms.

I'll second this post....Co-worker in our office is the constant baker. She swears by these insulated cookie sheets with parchment paper. Her cookies are always perfect.