John IS right about Walnut oil to treat wood surfaces. It is a 'drying oil' that does not remain sticky, and is safe. (I don't know if it has issues for that small portion of folks who are allergic) Pure Tung oil is also a good choice.

I wash wood cutting boards immediately after use with hot water, using a stiff bristled brush and allow them to air dry before applying a bit of oil (it doesn't take much!)

We have an old Hutch cabinet that belonged to my grandmother which has 3 'slide out' bread boards (or "extra space for settin' stuff boards") but they are way too soft for cutting board use.