Chocolate Oat Squares

I found this on Becky Higgin's website (she has a cooking section). They were devoured at the baptism I took them to.

1 c. plus 2 Tbsp. butter or margarine, softened, divided
2 c. packed brown sugar
2 eggs
4 tsp. vanilla extract, divided
3 c. quick-cooking aots
2 1/2 c. all-purpose flour
1 1/2 tsp. salt, divided
1 tsp. baking soda
1 can (14 oz.) sweetened condensed milk
2 c. (12 oz.) semisweet chocolate chips
1 c. chopped walnuts

In a mixing bowl, cream 1 c. butter and brown sugar. Beat in eggs and 2 tsp. vanilla. Combine the oats, flour, 1 teaspoon salt and baking soda in a separate bowl; stir into creamed mixture. Press 2/3 of oat mixture into a greased 9" x 13" baking stone (or pan). It's also fine in an 8" x 8" pan. You'll just have taller squares. In a saucepan combine milk, chocolate chips and remaining butter and salt. Cook and stir over low heat until chocolate is melted. Remove from the heat; stir in walnuts and remaining vanilla. Spread over the crust. Sprinkle with remaining oat mixture. Bake at 350 degrees for 25 minutes or until golden brown. Allow to cool. Cut into squares. Yield: 4 dozen.