Line a baking sheet with foil; coat foil with cooking spray.
Combine sugar, water, and cream of tartar in a medium saucepan; stir to dissolve sugar. Bring to a boil over medium-high heat. Cook until mixture is golden brown (about 6 minutes), stirring occasionally. Remove from heat, and stir in hazelnuts and vanilla. Spread mixture onto prepared baking sheet. Cool completely. Break into pieces.
Very easy and quite tasty, but it doesn't make very much. I used lightly salted, roasted peanuts instead of the hazelnuts. I will try doubling it next time. Also, I used nonstick aluminum foil for easier preparation and clean up.
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