Mix popped corn and nuts on cookie sheet. Combine sugar, margarine and Karo Syrup in a 1 1/2 quart saucepan. Bring to a boil over medium heat, stirring constantly. Continue boiling, stirring occasionally, 10-15 minutes or until mixture turns a light caramel color. Remove from heat. Stir in vanilla. Pour over popped corn and nuts, mix to coat well. Spread out to dry. Break apart and store in lightly covered container. Makes about 2 pounds.