In a saucepan, combine hearts of palm rice, almond milk, maple syrup, vanilla extract, cocoa powder, and a pinch of salt. Cook over medium heat until the mixture thickens. Stir in chia seeds and cook for 5 more minutes.
Preheat oven to 180°C (356°F). Place apple slices on a baking sheet lined with parchment paper. Drizzle with maple syrup and sprinkle with cinnamon. Bake for 8 minutes, or until tender.
To serve, layer the rice pudding in bowls. Top with baked apples, nuts, and mint leaves.