1. Preheat your oven to 180°C (350°F).
2. In a saucepan, melt the butter over low heat.
3. Cut your almonds, hazelnuts, walnuts, and pecans into small pieces.
4. In a mixing bowl, combine your chopped dried fruits, raisins, and oats with honey, melted butter, and cinnamon.
5. Using a mold or your hands, shape your cereal bars, place them on your baking sheet, and bake for 10 to 15 minutes.
6. Once out of the oven, let them cool for 5 minutes, then refrigerate for at least 1 hour.