Into a bowl, add the egg, the sugar and mix very well. Add the milk, the flour, the baking powder and mix again.
Split this batter into two separate bowls, add the chocolate milk powder to one of them, mix well.
In very hot oil, first fry the traditional beignets - pick them up with a spoon and pour a good amount of batter into the oil. Then fry the chocolate ones.
Coat the beignets in sugar, serve.