For the chia pudding base, whisk together chia seeds, soy milk, plant-based yogurt, minced dates, vanilla extract, cinnamon, cardamom, salt, and yellow miso paste (optional) in a bowl. Let sit for 5-10 minutes before chilling in the refrigerator for at least 4 hours.
Prepare the spiced apple topping by dicing apples and cooking them in a skillet with apple butter and maple syrup over medium heat until tender (7-15 minutes). Allow to cool.
For the crispy oat crumble, mix rolled oats, chopped walnuts or pecans, and minced dates in a bowl. Toast in a skillet or bake until golden brown.
To serve, layer chilled chia pudding with spiced apples and top with oat crumble.