There was this great design for a microwave that a UX designer proposed. One button for +30 seconds, no clock, and a door handle. That's it. Everything else is superfluous.
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On most microwaves I encountered one can just press the start button and it will do just that: Start with a 30s countdown and pressing it again will add 30s.
As a person who uses a microwave a lot this sounds terrible, I could live with 30s resolution, but not having adjustable power level would not be acceptable. Cooking anything on 100% power is just a recipe for uneven heating.
Based on the other commenter maybe two buttons: start/+30 seconds and power level in 25% increments.