Preheat oven to 350F. Line a baking sheet with parchment paper.
To make the hazelnuts, in a medium microwave safe bowl, add the butter and microwave until melted. Stir in the coconut sugar, salt, pepper, and cinnamon. Add the hazelnuts and stir to coat. Transfer to the baking sheet and bake for 10-15 minutes, stirring every 5 minutes, or until nuts are toasted and sugar is darkened and bubbling (13 minutes was the sweet spot for me).
In a mason jar with a lid, add the oil, vinegar, maple syrup, mustard, and salt and shake vigorously to combine.
Add radicchio to a large shallow salad bowl or mixing bowl. Toss with ⅔ of the dressing. Taste and add more dressing, if needed. Keep radicchio in your shallow salad bowl or transfer to a large serving platter (my preference because then you get nuts and cheese with every serving). Top with hazelnuts, cheese, and herbs.