Chocolate Revel Bars

1 c butter
2 c packed brown sugar
2 eggs
2 t vanilla
3 c quick cooking oats
2 1/2 c flour
1 t baking soda
1 1/2 t salt
1 14 oz can sweetened condensed milk
1 12 oz pkg milk chocolate chips
2 T butter
1 c chopped nuts (optional)
2 t vanilla

In a large bowl, cream together butter and brown sugar until fluffy; beat in eggs and 2 t of vanilla. Stir together oats, flour, baking soda and 1 t of salt; stir in creamed mixture until blended. Set aside. In a heavy saucepan stir milk, chocolate chips, 2 T butter and remaining 1/2 t of salt over low heat until smooth. Remove from heat; stir in nuts and vanilla. Put 2/3 of oat mixture into ungreased baking pan. Spread chocolate mixture over layer. Sprinkle with remaining oat mixture. Bake at 350 for 25-30 min. Cool, cut into bars.