If you read the manual for your microwave you’ll learn a lot about what it is capable of. My Panasonic microwave not only has a sensor cook mode for popcorn, but you can specify the weight of the bag and you can even add or subtract 10-30 seconds to dial it in prior to starting.

I recommend microwaves that have inverters in them, as well as moisture sensors.

My handwriting is publicly available as a font I made from scratch as a teenager, so definitely that one.