Pour some plain batter over the cooled crust.
Drop spoonfuls of the dulce de leche batter on top and swirl with a spatula.
Repeat with the remaining batters, ending with a swirl on top.
Tap the pan on the counter to smooth it out.
Wrap the bottom of the pan in foil and place it in a larger roasting pan. Add hot water to create a water bath.
Bake at 325ºF for 65-85 minutes. The center should jiggle slightly, and the edges should be set.
Turn off the oven and leave the cheesecake in for 1 hour.
Chill the cheesecake in the fridge for at least 6 hours.