If you have studied cannizarro, then it would be reasonable to think Tischenko might be fair game. Draw a cannizarro mechanism first, and then below it try to draw a similar mechanism for Tischenko.
Disclaimer: I don't specifically know if it works with t-butoxide. But t-butoxide is occasionally a nucleophile, mainly in situations where it has no possible way for it to act like base. For example, you can do Williamson ether synthesis (Sn2) with t-butoxide to make tert-butyl methyl ether. In this case the electrophile is a methyl halide.