In a small bowl, whisk together the tamari, lime juice, maple syrup, chipotle paste, smoked paprika, cumin, garlic powder and salt until smooth.
Place the dried mango slices into a resealable food bag or shallow dish. Pour in the marinade and swish or stir until the mango is evenly coated. Seal/cover and leave to marinate for 20-30 minutes at room temperature.
Set your oven to its lowest temperature (ideally 80-90°C fan) and line a large baking tray with parchment.
Arrange the mango slices on the tray in a single layer, not overlapping. Bake for 1–2 hours, flipping halfway through, until the strips are chewy and dry to the touch but not brittle.
Allow the jerky to cool completely. Store in an airtight container at room temperature for 2-3 days, or refrigerate for longer freshness (up to a week).