Preheat oven to 350.

Prepare a 9 x 13 pan with cooling spray or oil, then set aside.

In a medium sauce pan place butter and let it melt a little, then add the chocolate.

Melt the butter and the chocolate, stirring until smooth.

Set aside the chocolate and let is cool for a little bit.

Whisk in the sugar and the vanilla until smooth.

Add the eggs one at a time making sure each is incorporated.

In a medium bowl sift together the salt, cocoa and the flour.

Whisk into the chocolate mixture until just combined.

Bake the brownies for 25-35 minutes or until a toothpick comes out almost clean.

In a microwave safe bowl heat the dulce de leche for 1 minute or until softened.

Remove brownies from oven and spoon marshmallow cream in dollops over the top then drop dollops of dulce de leche between the marshmallow.

Let stand for a few minutes to soften and then swirl with a knife.

Cool pan on wire rack.