Butterscotch Pie - cooking recipe

Ingredients

3 Tbsp. butter
4 Tbsp. flour
1 egg
1 c. sweetened condensed milk
1 c. brown sugar
1 Tbsp. vanilla
baked pie shell
Cool Whip (optional)

Preparation

Put butter, flour, egg, sweetened condensed milk, and sugar into a saucepan. Bring to a boil.
Add vanilla.
Remove from heat. Pour into baked pie shell.
Let cool.
Add Cool Whip if desired.