Do not makethis cake according to the directions on the cake mix box. Mix the cake mix, eggs, melted butter and vanilla extract by hand in a mixing bowl. Spray a 9 x 13 cake pan with cooking spray and press the cake mixture into the pan. This makes the bottom layer of the cake.
Mix the topping ingredients with a mixer and spread over bottom cake layer.
Bake cake in a preheated 350 degree oven for 40 to 45 minutes until top of the cake is golden brown. Cut in squares to serve.