1 can (14 oz.) can sweetened condensed milk (1 1/4 cups)
2 Tbsp margarine or butter
1/2 cup chopped walnuts or pecans
2 tsp vanilla
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Let's Make It
In a very large mixing bowl, beat 1 cup margarine or butter with an electric mixer on medium to high speed about 30 seconds or till softened. Add about half of the flour. Then add brown sugar, eggs, 2 teaspoons vanilla, and baking soda. Beat till thoroughly combined, scraping sides of bowl occasionally. Then beat or stir in the remaining flour. Stir in the oats. Set oat mixture aside.
For filling, in a medium saucepan heat chocolate pieces, sweetened condensed milk, and the 2 teaspoons margarine or butter over low heat till chocolate is just melted, stirring occasionally. Remove from heat. Stir in walnuts and 2 teaspoons vanilla
For crust, press two-thirds (about 3 1/3 cups) of the oat mixture into an ungreased 15x10x1-inch baking pan. Then spread the chocolate mixture on top of crust. Drop the remaining oat mixture from a rounded teaspoon on top of chocolate layer.
Bake in a 350°F oven about 25 minutes or till top is light golden (chocolate will look slightly moist). Cool in pan. Cut into bars.