Add all ingredients to a large bowl (or mason jar), and whisk vigorously. The chia seeds and liquid should be well-combined. Make sure there are no chia seed clumps at the bottom of the bowl / mason jar.
Store in the fridge for at least an hour.
At the base of four ramekins (or glasses), layer one orange slice. Top with a few spoonfuls of chia pudding, evenly distributing the mixture across each glass.
Optional: sprinkle granola, a dollop of yogurt, or shredded coconut, etc. on top. Dig in!
The chia pudding will last—covered in the fridge—for up to five days.