Gooey Butter Cake

I was told that this is very good. I have one in the oven right now and will come back and post after I try it. :)

(18.5 ounce) package yellow cake mix
1/2 cup butter, melted
2 eggs
1 teaspoon vanilla extract
1 (8 ounce) package cream cheese
2 eggs
1 teaspoon vanilla extract
4 cups confectioners' sugar

DIRECTIONS
Preheat oven to 350 degrees F (175 degrees C).
Mix cake mix, melted butter or margarine, 1 teaspoon vanilla, and 2 eggs with a spoon. Pat into a 9 X 13 inch pan.
Mix cream cheese, 2 eggs, and 1 teaspoon vanilla with an electric mixer. Slowly beat in confectioner's sugar. Pour over cake layer.
Bake for 40 to 45 minutes. Cool.