Preheat your oven to 375°F (190°C) and lightly grease a small oven-safe ramekin or baking dish.
Core and dice the Honeycrisp apple into half-inch pieces, then toss them directly in the ramekin with 0.5 tsp of ground cinnamon.
In a small mixing bowl, combine the rolled oats, hemp hearts, sea salt, maple syrup, and melted coconut oil until the oats are well coated.
Spread the oat crumble mixture evenly over the top of the cinnamon-dusted apples.
Place the ramekin in the oven and bake for 20 to 25 minutes, or until the apples are soft and the oat topping is golden brown and fragrant.
While the crumble is baking, whisk together the Greek yogurt, vanilla extract, and the remaining 0.5 tsp of cinnamon in a serving bowl.
Remove the apple crumble from the oven and let it sit for 5 minutes to allow the juices to thicken.
Spoon the warm apple crumble over the chilled yogurt base and enjoy immediately.