BASE AND TOPPING:

1 c. butter
1 1/2 c. brown sugar
1 egg
1 tsp. vanilla
2 c. flour
1 tsp. salt
1 tsp. baking soda
2 1/2 c. oats

FILLING:

1 (12 oz.) pkg. chocolate chips
1 (15 oz.) can sweetened condensed milk
2 tbsp. butter
1/2 tsp. salt
1 tsp. vanilla

Beat together butter and sugar. Blend in egg and vanilla. Add flour, soda and salt. Stir in oats. Press half of mixture onto bottom of pan. Melt chocolate chips, condensed milk, butter and salt. Stir in nuts and vanilla. Spread over base. Sprinkle reserved mixture evenly over chocolate and press down slightly. Pour into sprayed 9 x 13 inch pan and bake at 350 degrees for 35-40 minutes. Cool and cut into bars.