Peel the bananas, cut them into slices, spread them on a plate lined with foil, freeze overnight. Pour 400 ml milk, 3 tablespoons brown sugar and 4 tablespoons chia seeds into a screw glass, shake vigorously. Leave to swell in the refrigerator for about 12 hours. Shake well for the first hour.
Puree the frozen bananas, 200 ml milk, almond paste, 1 tbsp brown sugar and 1 tsp cinnamon with a powerful hand blender to a smooth ice cream. Divide half of the chia pudding into four glasses. Immediately add half of the ice cream, then layer the rest of the pudding and ice cream. Serve immediately sprinkled with some cinnamon and chia seeds.