In a small bowl, whisk together brown sugar, ground cinnamon and Kosher salt.
Place hot sweet potato fries in a large mixing bowl. Sprinkle half of the brown sugar seasoning over top. Toss. Top with remaining seasoning, tossing again.
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If fries aren't hot enough, the sugar won't melt or dissolve, you can place them back into the oven to melt the sugar. Bake at 350 for 5 minutes or give them a quick hit under the broiler.Optional seasoning: