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Put the popcorn kernels in a brown paper lunch bag. Fold it over 1/3 of an inch and make a firm crease.Fold it again two more times, creasing it well each time so it forms a tight seal that will prevent air from escaping as the corn pops.
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Set in the microwave on its “back” and microwave on high for 2 1/2 to 3 minutes or until the popping nearly comes to a stop.
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Empty the popcorn into a medium bowl.
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Drizzle with the butter. Sprinkle with salt and sugar, and toss several times to coat. Give the cinnamon a few shakes over the popcorn and toss again.