Fudge Oatmeal Bars

Found on Taste The Joy

1 C butter
2 C brown sugar
2 eggs
2 tsp vanilla
2 ½ C flour
1 tsp soda
½ tsp salt
3 C oats
Mix. Put 2/3 in 9x13 pan. Spread filling over top. Sprinkle rest of batter on top. Bake at 350 for 20 minutes.
Filling:
12 oz pkg semi-sweet chocolate chips
1 can sweetened condensed milk
2 TBS butter
Melt. Add:
1 C nuts (opt)
2 tsp vanilla