In a sizable bowl, combine the chicken hearts, cumin, smoked paprika, olive oil, salt, and pepper.
Mix everything together with a large spoon or your hands to evenly distribute the oil and seasonings over the hearts.
For about 3 minutes, heat a sizable, heavy frypan over medium-high heat.
Add the chicken hearts with seasonings. Cook for 5-7 minutes, stirring frequently, until well cooked and browned. Reduce the heat to medium if the pan gets too hot.
Place the hearts among the four plates. Serve them with a parsley garnish and a drizzle of the pan juices.