Hello!
My favorite recipe comes by Nick Malgieri.
12 TBS unsalted butter, softened
1 1/2 cups sugar
2 cups all-purpose flour
2 tsp baking powder
1/4 tsp salt
6 large egg whites (3/4 cup)
3/4 cup milk
2 tsp vanilla (or 1 tsp vanilla + 1 tsp almond
If you want a moister cake, brush it with a simple sugar syrup (I like 1 part sugar, 2 parts water) and add a little of a nice liquour.