In a 1-1/2 quart casserole dish, stir together sugar and syrup. Microwave on High for 4 minutes. Stir in the hazelnuts and microwave on High for 3 to 5 minutes. Add butter and vanilla, blending well. Microwave on High for 1 to 2 minutes. Pour mixture onto a lightly buttered warm cookie sheet. Let cool for 1/2 to 1 hour. Break into small pieces and drizzle with white and milk chocolate. Store in an airtight container in a cool place.
