Preheat oven to 350 degrees and lightly grease 9x13" baking dish.

Mix oats, softened butter, flour, brown sugar and dash of salt together by pressing butter into dry ingredients with a fork until well combined and crumbly mixture is formed.

Spread oat crumble into baking dish, and press firmly until mixture evenly coats the bottom of the pan.

In a medium sauce pan, whisk condensed milk, chocolate chips, vanilla extract and sugar over medium heat until melted and smooth.

Pour chocolate mixture over prepared oat crust and spread to form an even layer.

Add natural peanut butter in large dollops on top of the chocolate ganache layer. Use a knife to gently swirl the peanut butter into the chocolate layer, being careful not too press to firmly and disturb the oat crust.

Sprinkle with chopped peanuts and additional chocolate chips. Bake in preheated oven on center rack for 20 minutes.

Allow a minimum of 10 minutes to cool, slice and serve.