1. Cut nuts and dried fruit into small pieces.
2. Bring sugar, honey, and water to a boil as syrup in a pot. Add peanut butter and butter until everything has dissolved. Stir in muesli mixture.
3. Divide the mixture onto a baking sheet lined with parchment paper and press firmly. Bake at 160° circulating air in a preheated oven for approximately 12 to 15 minutes. The muesli mixture should be golden brown and caramel-colored.
4. Remove from oven, cover with parchment paper, and press firmly with a wooden board. When cooled, the mixture can be cut into slab form with a sharp knife.