Cream butter, sugar, and cream cheese until creamy. Add eggs 1 at a time and beat between until all eggs have been beaten into the mixture. Add flour about 1/2 cup at a time beating between. Add vanilla at the end and beat into the mixture. Works best if you can continuiously beat all the way through.
Bake in a greased bunt pan at 325degrees F until done. I have found that you may have to adjust the temperture depending on the oven. NO JUMPING, CAKE CAN FALL!