MacBook Air stuck on Windows (bootcamp) recovery mode

I was preparing my Mac for a trade in. I entered the recovery mode: restart CMD + R. Then went to utility and erased the hard disk. BOOTCAMP was the other disk on there, so I erased it too. Then tried to restart the Mac, but it always goes to the blue windows recovery mode screen.

I tried holding the option key and the only bootable device available is the windows (bootcamp).

I’m stuck not sure what to do at this point.