2½ cups flour
1 tsp baking soda
1½ tsp salt, divided
1 cup butter or margarine at room temperature
2 cups packed brown sugar
4 tsp vanilla, divided
1 14oz can (1⅓cup) sweetened condensed milk
1½ cups semisweet chocolate chips
2 Tbsp butter or margarine
½ cups walnuts or pecans (optional)
Preheat oven at 350. Combine oats flour, soda and 1 tsp salt. In a separate bowl, beat 1 cup butter for 30 seconds, add brown sugar and beat until fluffy. Add eggs and 2 tsp vanilla; beat well. Gradually stir dry ingredients into mixture, stir until well blended.
In a saucepan heat together sweetened condensed milk, chocolate chips, 2 Tbsp butter and ½tsp salt over low heat stir until smooth. Remove from heat, stir in nuts and remaining 2 tsp vanilla.
Pat ⅔ of the oatmeal mixture in the bottom of an ungreased 15x10x1 inch backing pan. Spread chocolate mixture over oatmeal dough. Dot with remaining oatmeal mixture. Bake at 350 for 25 to 30 minutes. Cool before cutting into 1 by 2 inch rectangles.