Preheat oven to 325° F (160° C) and line with a greased foil a 13- by 9-inch (3.5 L) cake pan.
In a bowl mix together oats, raisins, sunflower seeds, peanuts and chocolate chips. Add condensed milk and mix thoroughly. Stir in melted butter until blended.
Spread evenly in prepared pan. Bake in preheated oven for 25 to 30 minutes or until top is lightly browned. Place pan on a rack to cool slightly, then transfer cake, with foil, to a cutting board and cut into bars.
Notes
I substituted the raisins with dried cranberriesd I had on hand.