Scrape half the batter into prepared pan, Drop 1/3 of the dulce de leche in prune-sized dollops, evenly spaced, over the brownie batter. Then drag a knife through to swirl slightly. Spread the remaining brownie batter over the top and drop the remaining dulce de leche over the batter. Again use a knife to SLIGHTLY swirl the dulce de leche, if you over do it, it will tun into a bubbly mess. **drag the knife one or twice max.