In a large skillet or Dutch oven, heat the vegetable oil to 350°F (170°C). Remove the biscuit dough from the package, and cut out the middles with a donut cutter, or a small round cookie cutter. Carefully place each donut and middle piece in the heated vegetable oil, and fry the donut until brown, about 20 seconds. Using tongs, carefully flip the donuts and middle pieces to the other side, and fry for another 20 seconds. Remove the donuts to a pan lined with paper towels, and keep warm until all the donuts are fried.

Pour the dulce de leche into a shallow bowl or plate. Dip the cooled donuts in the dulce de leche, and place on a cooling rack. Dip only one side of the donut, for easier handling. Once all the donuts have been glazed, dip them one more time in the dulce de leche.

Makes 8 donuts, with middles