Make base: Preheat oven to 350 degrees; grease 9x13 pan. Mix yellow cake mix, stick of butter, and one egg. It will be thick. Spread into pan, press onto bottom & sides kind of like pie crust.

Make top: Next, mix together cream cheese, powdered sugar, eggs, and vanilla extract for three minutes on low speed of mixer. Pour batter into crust.

Bake: Bake for 30-40 minutes. Sprinkle with powdered sugar while warm if desired.