Homemade Oreo Cookies

This is my favorite cookie recipe. It comes from The Essential Mormon Cookbook, which I got from a friend when I was getting married. They are very similar to the Oreo Cakesters you can buy at the store, but these are much better! With this recipe, I think the filling turns out a little runny, so I add more powdered sugar until it thickens up a bit. This in turn leaves you with a lot of filling! :) Or, you can freeze the filling a bit before using it. But don't feel obligated to do either one! The recipe goes as follows:
Ingredients:
1 box devil's food cake mix (Betty Crocker brand works well)
3/4 cup butter or margarine, softened
2 eggs
1 (8 oz.) pkg. cream cheese, softened
1/2 cup butter
2 tbsp. vanilla
2 cups powdered sugar
Method:
In a large bowl combine cake mix, the 3/4 cup butter, and eggs. Chill about 10 minutes. Roll into small balls. Place on a greased baking sheet. Bake at 350 degrees F for 7 to 9 minutes. Cool.
To prepare filling, beat cream cheese, the 1/2 cup butter, and vanilla together. Add powdered sugar and mix together. Spread filling on top of cookie, and then top with another cookie. Makes about 2 dozen cookies.