Mix 125 g low-fat quark with 50 ml milk in a bowl until smooth and creamy.
Place 100 g frozen raspberries and 1 tablespoon water in a saucepan over medium heat. Simmer for 5 min until the raspberries soften and release their juices. Stir in 1 teaspoon maple syrup.
Pour the quark mixture into a cereal bowl and top with the hot raspberries. Scatter 10 g walnuts over the top and serve immediately.