I doubled the recipe for this cake as it was made for 15 children.
preheat oven to 350 degrees . Grease and flour a 9x9 inch pan
In a medium bowl, cream together the sugar and butter. Beat in the eggs, one at a time, then stir in the vanilla. Combine flour and baking powder, add to the creamed mixture and mix well. Finally stir in the milk until batter is smooth. Pour or spoon batter into the prepared pan.
Bake for 30 to 40 minutes in the preheated oven. Cake is done when it springs back to the touch.
Recipe by Hello Sensible at https://hellosensible.com/rainbow-dash-birthday-cake/