Whisk the chia seeds, almond milk, vanilla extract, and sea salt in a small bowl and let it sit for at least 15 minutes until it reaches a thick, gel-like consistency.
Core and dice the apple into small, uniform cubes while the chia seeds soak.
Heat the coconut oil in a small skillet over medium heat, then add the diced apples and ground cinnamon.
Sauté the apples for 5 to 7 minutes, stirring occasionally, until they are softened and lightly caramelized.
In a tall glass jar or bowl, begin the parfait by layering half of the thickened chia pudding at the bottom.
Add a layer using half of the nonfat Greek yogurt, followed by a generous spoonful of the warm cinnamon apples.
Repeat the layers with the remaining chia pudding and the rest of the Greek yogurt.
Finish the parfait by topping it with the remaining sautéed apples and a sprinkle of hemp hearts for added texture and nutrition.