Butterscotch Icebox Pie

Ingredients:     
3/4 c. brown sugar
4 Tbsp. flour
1/4 tsp. salt
2 c. milk
2 egg yolks, beaten
2 Tbsp. oleo
1 tsp. vanilla
 

Directions:
Combine sugar, flour and salt. Stir in milk slowly. Cook over boiling water until thick (preferably in double boiler, but you can put one saucepan inside another). Cover and cook 10 minutes, stirring 2 or 3 times. Add egg yolks and stir hard. Cook 1 minute. Add butter and vanilla. Pour into prepared (baked) pie crust. Refrigerate. Serve covered with whipped cream.