Chocolate Revel Bars

1 c. butter, softened
2 c. packed brown sugar
1 tsp. baking soda
2 eggs
2 tsp. vanilla
2 1/2 c. all-purpose flour
3 c. quick-cooking rolled oats
1 1/2 c. semi-sweet chocolate chips
1 14-oz. can (1 1/4 c.) sweetened condensed milk or low-fat sweetened condensed milk
1/2 c. chopped walnuts or pecans
2 tsp. vanilla

Set aside 2 tablespoons of the butter. In a large mixing bowl, beat the remaining butter on medium to high speed for 30 seconds. Add the brown sugar and baking soda. Beat until combined, scraping sides of bowl occasionally. Beat in eggs and 2 teaspoons vanilla until combined. Beat in as much of the flour as you can with the mixer. Stire in any remaining flour. Stir in the rolled oats.

For filling, in a medium saucepan, combine the reserved 2 tablespoons butter, chocolate pieces, and sweetened condensed milk. Cook over low heat until chocolate melts, stirring occaisonaly. Remove from heat. Stir in the nuts and 2 teaspoons vanilla.

Press two-thirds (about 3 1/2 c.) of the rolled oats mixture into the bottom of an ungreased baking pan. Spread filling evenly over the oats mixture. Dot remaining rolled oats mixture on filling. Bake in a 350 oven about 25 minutes or until top is lightly browned (chocolate filling will still look moist). Cool on a wire rack. Cut into bars.