Caramel Walnut Bars

This is a recipie my mom found on the back of a can of Eagle Brand condensed milk years ago. They are gooey and delicious.

2 c. flour
3/4 c. brown sugar
1 egg-beaten
3/4 cup margarine or butter
3/4 c walnuts-chopped
24 caramels-unwrapped
1 can sweet condensed milk

Preheat oven to 350. In large bowl combine flour, sugar and egg. Cut in 1/2 cup margarine until crumbly. Stir in walnuts, reserving 2 cups crumb mixture, press remainder firmly on bottom of greased 9x13 pan. Bake 15 minutes. In saucepan, over low heat melt caramels with sweet condensed milk and remaining margarine. Pour over prepared crust. Top with reserve crumb mixture. Bake 20 minutes or until bubbly. Cool. Cut into bars.