Preheat oven to 350 degrees. Spray a 13X9 pan with spray.
Combine flour, oats, sugar, and butter. Reserve 1 cup, press remaining mixture in pan. Bake 10 minutes.
Pour condensed milk evenly over crust. Sprinkle with nuts and chocolate morsels. Top with remaining oat mixture. Press down. and bake 25-30 minutes. Cool.