Spoon the full-fat quark into a bowl and stir until smooth. The full-fat variety provides some fat that, together with the protein, ensures stable blood sugar and prolonged satiety.
Roughly chop the walnuts and toast them together with the pumpkin seeds briefly in a dry skillet, until the seeds begin to pop and everything is fragrant.
Scatter the toasted nuts and seeds over the quark and dust with cinnamon. Finally, distribute the blueberries on top and eat immediately while the nuts are still crispy.