Place cheese, cornstarch, yucca starch, sugar, salt and baking powder in a large mixing bowl. Stir in the eggs and mix until well combined. If the dough appears dry, add the milk slowly as needed to form a smooth dough that holds together. Shape dough into 1.5-inch balls and set aside. In a deep pot, heat the vegetable oil at roughly 300 degrees. (warm, not very hot). Carefully drop the balls in the warm oil. * You'll know the oil is at the right temperature when a buñuelo added to the oil sinks to the bottom, then rises to the surface within a minute. Test with one buñuelo and adjust temperature accordingly. For the first few minutes, the buñuelos will rotate themselves, but keep an eye on them to make sure they brown evenly. Remove from oil and drain on a plate lined with paper towels. Enjoy with hot chocolate!