Place the sheet of puff pastry dough on a cutting board. Use a 3-4 inch cookie cutter or bowl as a guide to cut rounds of dough out of the entire sheet of dough. Use a 1-inch cookie cutter to cut out a small hole in the center of each of the rounds.
Preheat a pot of vegetable oil to 350 degrees Fahrenheit. Fry the pieces of dough for 2-3 minutes per side, until golden brown. Place onto a cooling rack to drain of any oil and to cool.
Meanwhile, melt the butter in a small frying pan. Mix the sugar and cinnamon in a small bowl until combined.
Once the donuts are done frying, brush with butter then coat in the cinnamon-sugar mixture. Repeat with the rest of the dough.
Serve immediately or place in an air-tight container for up to 2-3 days.
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