can't Eat Just One Piece cake

1 box butter recipe cake mix Glaze: 1/2 stick butter 1/2 c. brown sugar 6 T. water 1 t. vanilla
Bake cake according to pkg. directions for 9x13 inch pan. For glaze bring water and sugar to a boil, add sugar stirring and cooking until dissolved. Add vanilla. Pour over cake while still warm.