Preheat oven to 350°. Line a greased 9 by 13 inch glass pan with waxed paper.

In a bowl combine eggs, water and oil; add cake mix & pudding and mix well

Scrape batter into pan & bake for 30 to 40 minutes or until a toothpick comes out clean.

Now here's the tricky part: when the cake is partly cooled off invert onto a cookie sheet or something flat.. peel off the waxed paper and carefully cut the cake in half (mine is never totally even bt you cant really see it:) ...now put the top part of the cake (it would be the bottom) back in the pan and cool completely.

Meanwhile mix the sugar & flour in a sm saucepan; stir in milk and cook until thickened, stirring constantly. Cool completely. (Or if you want to make it alot easier, you can buy storebought frosting & go to step 7)

Cream butter & oleo together with vanilla; add cooled milk mixture and beat on high until fluffy.

Spread filling on bottom half of cake. Carefully put the other half on top. Cut in squares to serve.. Keep covered in a cool place.