Preheat your oven to 350°F (175°C). Grease or line a 9x13 inch baking pan.
In a large bowl, combine cake mix, 2 eggs, and melted butter. Mix well and press into the bottom of the pan.
In another bowl, beat cream cheese until smooth.
Add the remaining 2 eggs, powdered sugar, and vanilla extract. Mix until creamy.
Pour the cream cheese mixture over the crust and spread evenly.
Bake for 35–40 minutes or until the top is golden brown and the center is set.
Cool completely before slicing into bars.
Store in the fridge for up to a week for best texture and taste.