Coat 10-inch ovenproof skillet with butter; sprinkle with 1 tbsp. sugar to coat. In bowl, whisk remaining sugar and next 4 ingredients until smooth. Pour into skillet; top with hazelnuts. Bake at 375 degrees until puffed, 15 to 18 minutes. Serve with whipped cream.
The Do's and Don'ts of Cooking with Chocolate