Line an 8x8 or 9x9 baking dish with foil or parchment. Apply non -stick cooking spray. Measure out the two kinds of chocolate, separately, and open the can.
Over low heat in the microwave or on the stovetop, melt the white chocolate. Once it is smooth and completely melted, mix in the dulce de leche and a pinch of salt. Stir until the color is consistent. It will be very thick.
Glop it into the prepared baking dish and smooth out the top with a rubber or offset spatula.
Melt the darker chocolate morsels in the microwave; 30 seconds, stir, then another 20-30 seconds should do it. Pour the melted chocolate over the fudge. Even it out with your trusty spatula. Sprinkle salt over the top.
Let it cool completely on the counter or in the fridge for 3-4 hours, until it's set. The chocolate top will likely crackle some as you cut it, but that's okay. It makes tasty crumbs. Cut into small squares.
Leftovers will keep sealed in fridge for upwards of a week.
OM NOM NOM!