Separate any pieces of mango that are sticking together and place them in a medium mixing bowl. Add 1 Tablespoon chamoy and toss to coat until all of the mango pieces are evenly coated. Sprinkle evenly with 1 Tablespoon Tajin Classico seasoning and toss to coat until the Tajin is evenly distributed.
Prepare a baking sheet with parchment paper or a silicone baking mat. Spread the coated mango out on the baking sheet. Place in the oven at 170°F to 200°F until the coating is dry to the touch, about 10 minutes (flip the mango pieces once or twice during the drying time to make sure the bottoms dry out too).