Preheat oven to 350 degrees F. Line baking sheet with parchment paper and lightly grease.
Mix the nuts, brown sugar, cinnamon, cayenne, salt, water and oil in a bowl. Spread evenly onto prepared baking sheet. Bake for 12 - 15 minutes, until nuts have nearly set. Let cool.
Sage Vinaigrette
In a small bowl, combine salad dressing ingredients, and whisk until combined. Set aside while assembling the salad.
Salad Assembly
Strip kale from the stem, and roughly chop the leaves. Add to a large bowl. Massage kale (by squeezing it with your hands) for 2 minutes.
Chop apple into cubes, and add to bowl with brie & spiced nuts. Toss salad with sage dressing, and serve immediately.