In a mixing bowl, whisk the flour, sugar, baking powder, and salt together.
Add the egg, milk, and vanilla extract. Stir until just combined—it’s okay if it’s a little lumpy.
Heat oil in a deep pan over medium heat (about 350°F).
Drop small spoonfuls of batter into the hot oil. Fry until golden brown, flipping once.
Remove bites and drain on a paper towel.
Dust generously with powdered sugar and serve warm.