Grease the bottom and sides of four 6-oz. ramekins; sprinkle each with 1 teaspoon sugar. Place ramekins on a baking sheet; set aside.
In a medium microwave-safe bowl, melt butter and chocolate; stir until smooth. Stir in confectioners’ sugar until smooth. Whisk in the eggs, egg yolks, instant coffee and vanilla. Stir in flour and salt; spoon batter into prepared ramekins.
Bake at 400° for about 12 minutes or until a thermometer reads 160° and cake sides are set and centers are soft.
Remove ramekins to a wire rack to cool for 5 minutes. Carefully run a small knife around cakes to loosen. Invert warm cakes onto serving plates. Lift ramekins off cakes. Serve warm with whipped cream or sprinkle with additional confectioners’ sugar if desired.Yield: 4 servings.