
Preheat oven to 350 degrees F (175 degrees C).
Mix cake mix, melted butter, 1 teaspoon vanilla, and 2 eggs with a spoon. Pat into a 9x13-inch pan.
Mix cream cheese, remaining 2 eggs, and remaining 1 teaspoon vanilla with an electric mixer. Slowly beat in confectioner's sugar. Pour over cake layer.
Bake for 40 to 45 minutes. Cool.