Ruth's Sour Cream Candy

Spray a large rectange of waxed paper with vegetable oil spray. Combine the sour cream and brown sugar in a medium-size heavy saucepan, bring the mixture to a boil over medium heat, and boil until it reaches soft ball stage (238°) on a candy thermometer.

Remove the pan from the heat and beat the mixture until it is creamy (this can take a long time). Stir in the nuts and vanilla and drop by teaspoonsful onto the prepared waxed paper.