3 c. sugar
1 (14 oz.) can sweetened condensed milk
1 1/2 tsp. pumpkin pie spice
1 (7 oz.) jar marshmallows creme
2 tsp. vanilla extract
2 sticks (1/2 lb.) butter
1 c. cooked, mashed sweet potatoes
1 (8 oz.) butterscotch morsels
1 c. chopped nuts

In heavy saucepan, combine sugar, butter, milk, sweet potatoes and spices. Bring to a boil, stirring constantly. Continue boiling over medium heat, stirring constantly, until mixture reaches 234°F on candy thermometer, about 10 minutes. Remove from heat; stir in butterscotch morsels. Add marshmallow creme, nuts and vanilla. Mix well and pour quickly into 13 x 9 pan, spreading evenly. Cool, cut in squares and store tightly wrapped in refrigerator.