your favorite brownie box mix (plus the eggs, oil, water it requires) or you could use your favorite homemade brownie recipe
1 cup dulce de leche (usually found in the Latin aisle of the store)
Line an 8x8" baking dish with tin foil and spray with cooking spray. Pour in half of your brownie mixture, and spread out evenly. Dollop half the dulce de leche on top of the brownie mixture in several small drops. Take a knife and swirl the dulce de leche. Pour on the other half of the brownie mix and smooth with a spatula. Put on the remaining dulce de leche in small dollops, and swirl again. Bake according to brownie mix directions. Mine called for a 350 degree oven and it took a little over 40 minutes to bake. Allow to cool a bit, slice and serve!