Peel mandarins, separate slices, and spread evenly across a small baking sheet or large plate lined with parchment paper.
Place mandarins in the freezer. Meanwhile, microwave chocolate chips and coconut oil together in a small bowl for about 60 seconds or until the chocolate is fully melted when you stir it together.
Remove mandarins from freezer and dip into the melted chocolate to cover about half the mandarin slice. Sprinkle with flaky salt while the chocolate is still melted so that it sticks. The chocolate will harden quickly because the mandarin slices are cold.
Once all slices are coated, place in the freezer for about 5 min to fully firm up the chocolate if eating right away. Otherwise, store the mandarins in the fridge until they are ready to eat.
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Notes
Store these in an air-tight container in the fridge, not the freezer so that the mandarins still stay soft and juicy.