Place the cookies 1 sheet at a time into the oven and bake until golden brown. This should be for 10 minutes, but take them out a minute early to check: They should be flattened but still a bit puffy. The edges will have begun to set but the centres should still be very soft.
Do NOT bake them until they feel done or they'll end up hard instead of soft and chewy. The cookies will continue to cook from the residual heat of the baking trays as they cool.