… place into the refrigerator until chilled, about 1 hour. Divide dough in half.
Working on a lightly floured surface, roll dough into 1/2-inch thick rounds; cut out rounds with a 2 1/2-inch cutter.
Heat vegetable oil in a large stockpot or Dutch oven over medium high heat until a deep-fry thermometer registers 375 degrees.
Working in batches, add donuts to the Dutch oven and cook until evenly golden and crispy, 1 minute per side. Transfer to a paper towel-lined plate for 30 seconds; then roll warm donuts in cinnamon sugar mixture to coat.
Serve warm.
(Recipe originally seen here.)