I love all kinds of cookies and I’m here to answer your question about how long to bake cookies at 350 degrees. The short answer is, you can expect to bake cookies at 350 degrees F for between 8 to 12 minutes.
General Cookie Baking Times: For all cookies, preheat your oven to 350 F before baking, and line the pan (s) with parchment paper, or use a silicone pan liner. *For drop cookies, ​the baking time will depend on dough density and temperature. Plain butter or sugar cookie dough will take less time to bake than a Kitchen-Sink cookie dough.
Mixing Cookie Dough: For the best results, make sure your butter, eggs, and any other chilled ingredients are at room temperature before mixing the cookie dough. The dough will come together faster, be more homogenous, and it will just be an easier baking experience if everything is at the same (room) temperature.
Frozen or chilled dough will take longer than room temperature dough to bake. Just keep an eye on the cookies as they bake and remove them when they start to color around the edges and lose their raw shine in the middle. Bar Cookies: The bake time will depend on how thick the bars are, so check them often.