Cut the ripe avocado in half, remove the pit and scoop out the flesh. Place this along with the two handfuls of fresh spinach and a small splash of water in a blender. Mix on high speed until a smooth, even green puree forms without any lumps.
Spoon the full-fat quark into a large mixing bowl. Add the freshly made green puree. Stir the mixture together until the quark is completely green and the spinach and avocado are fully incorporated into the dairy.
Divide the mixed quark evenly between two bowls. Sprinkle the four tablespoons of hemp seeds and the two tablespoons of pumpkin seeds over the top of both servings for extra texture.
Finish with a pinch of cinnamon sprinkled over everything. Serve the quark bowls immediately while the mixture is still cool and the seeds and nuts retain their crunchiness.