Per your example, you would take the $1000 that was added to your W-2, divide by number of shares (100) and add the amount of $10 to your Cost Basis for each share when reporting the sale of the remaining shares from your 1099-B.
Your employer may have issued a Form 3922 showing the Exercise Price per share, to which you add the difference you were taxed on your W-2 to get the corrected Cost Basis.
You should end up with a small Capital Gain or Loss.
Here's more info on RSU's and Taxes.
@bmshah1
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