In small saucepan combine whipping cream, sugar, butter and instant coffee; cook over low heat, stirring constantly, just until mixture boils.
Remove from heat; immediately add chocolate chips. Stir until chips are melted and mixture is smooth when stirred. Add vanilla extract. Pour into small bowl; chill, stirring occasionally, until mixture begins to set. Cover; chill several hours or overnight to allow mixture to ripen and harden.
Form small amounts of mixture into 1/2-inch balls, working quickly to prevent melting; roll in nuts or chocolate. Cover; store in refrigerator. Serve cold.
