Cream Cheese Sugar Cookies

1 cup butter, softened
3 ounces cream cheese, softened
3/4 cup sugar
1 egg
1 tsp vanilla
3 cups AP flour

In large mixer bowl combine all ingredients except flour. Beat at medium speed, scraping bowl often, until well mixed. Reduce speed to low and add flour. Beat until flour is incorporated.  Wrap in plastic wrap. Chill dough at least two hours before rolling. Bake at 375 F for 7 - 10 minutes.