Use one of the holes to practice if your oil is hot enough. You want it to start sizzling right when you put your dough in, if not, the dough will absorb a lot of the oil instead of having the oil cook it. Once it is hot enough, carefully place your donuts into the oil. I did one at a time, and cooked for 30 seconds to 1 minute per side. I used tongs to flip the donut and to take them out of the oil. Let the donuts rest and drain on a paper towel while you finish the rest.