Meanwhile, bring 2 tablespoons of oil in a large (12-inch) oven-proof skillet over medium-high heat. When whisps of smoke start to rise from the pan, reduce heat to medium, add balls and cook until well browned on one side. Turn the balls over and continue to cook on the remaining side until well browned, about 3 minutes longer. Transfer skillet to the oven and bake until balls are firm, about 25 minutes.