Your cost basis is what you paid for the shares upon vesting, plus the amount you were taxed on your W-2 (discount). Divide the amount you were taxed on your W-2 by the number of shares that vested.
Add that amount to the Exercise Price (you may have Form 3922/24 stating this price), for your Cost Basis per share. If you only have one 1099-B for shares sold for taxes, you should end up with a small gain or loss. In TurboTax, you can enter this this as a regular stock sale, but you may need to check the box to indicate that 'cost basis is missing or incorrect' so you can enter the correct cost basis, if it is incorrect on your 1099-B.
Here's more info on Employee Stock Purchase Plans.
@elenluni
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