Preheat oven to 350ºF (315ºF if using glass dish).
In medium bowl, combine oats, flour, coconut, nuts, sugar, baking powder
and butter; stir to form a crumbly mixture. Set aside.
In medium bowl, combine sweetened condensed milk and lemon juice.
Pat ½ the crumb mixture in pan.
Spread lemon mixture over top and then sprinkle with remaining crumbs.
Bake 25-30 minutes or until lightly browned.
Cool thoroughly before cutting