What buttons? Pretty much every microwave I've ever seen looks like this[0] - timer + power setting. Even our kitchen at work which has some really fancy microwaves only offers time + power, nothing else. The ones full of buttons on the front are from like....American movies, not something I ever see in real life :P
[0] https://asda.scene7.com/is/image/Asda/5054781247296?hei=532&...
Most I have seen look like this
https://www.google.com/search?q=microwave+buttons&source=lnm...
Absolutely you can "cook" things in microwaves, people do it all the time.