Hello does anybody know if TurboTax can provide me with an income verification letter?

TurboTax has no way to provide a proof of income letter.

Any amount in TurboTax was input by you so its presence in TurboTax would not be proof that it is your income. Proof would be the original documentation of the amount you reported. 

Even if you used the FULL SERVICE program where a paid tax pro does the return for you  they will not give you such a letter ... I don't in my private practice.   If you need to prove income then show them your bank records and/or bookkeeping records ... ask them what they will accept.