In a large mixing bowl, whisk together the dry ingredients: all-purpose flour(1 cup), granulated sugar(2 tablespoons), cornstarch(1 tablespoon), baking powder(½ teaspoon), salt(¼ teaspoon).
Then add the wet ingredients and mix until combined: milk(½ cup), vanilla extract(1 teaspoon), egg(1 large), vegetable oil(1 tablespoon). The batter will be semi-smooth (a few clumps are okay).
Pour batter into piping bag or gallon-sized ziploc bag and cut off the end. You want the hole to be about the width of a pencil.
Cover the bottom of skillet with about 1" vegetable oil and heat to 375℉ (I did medium-high on my stove). You want it hot enough for the batter to start sizzling but don't want it so hot that the batter turns brown right away. It's best to first test a little bit of batter to see how it fries up.
Slowly drizzle the batter into the pan, criss-crossing it back and forth until you create a large circle. Allow it to cook until golden brown, then flip and cook the other side until golden brown.
Place on a paper-towel lined baking sheet and sprinkle with powdered sugar until fully covered.