To make this recipe really quick and easy to assemble, prep the components ahead of time. The mango salsa and chipotle dressing keep well for about 4 days, and the pickled onions last for two weeks or more in the fridge.
Arrange the grilled sweet potato rounds on a platter and drizzle with 2 tablespoons of the chipotle dressing.
Evenly scatter the mango salsa, black beans, corn, cheese, onions, serrano, and cilantro on top. Drizzle with more chipotle dressing. Season to taste with salt and pepper and serve.