Cheesecake Brownies

From Allrecipes.com:

1 (19.8 ounce) package brownie mix
1 (8 ounce) package cream cheese
1 egg
1/3 cup white sugar
1 tsp vanilla

1. Prepare the brownie mix as directed on the box. Preheat oven to temperature indicated on box. Grease a 9x13 inch pan.

2. Spread the brownie batter evenly into the prepared pan. Using an electric mixer, beat together the cream cheese, egg, vanilla, and sugar until smooth. Dollop the cream cheese mixture on top of the brownie batter. Swirl together using a knife or skewer.

3. Bake according to instructions. Brownies will be done when a toothpick inserted comes out clean.