Cream Cheese Brownies

1 box chocolate cake mix, or can use brownie mix (for 9x13 pan)
1/4 c flour
1- 8 oz pkg cream cheese, softened
1 egg
1/3 c sugar
1 c chocolate chips
1/2 tsp vanilla

Prepare mix as directed, except add an additional 1/4 c flour.   Pour into greased 9x13 pan.   In a separate bowl, mix cream cheese, sugar, egg, and vanilla.  Beat until smooth.   Stir in chocolate chips.   Drop by tablespoons on top of cake.   Take a knife and swirl cream chesse mixture through cake.   Bake at 350 deg for 40-45 min.