Take a medium-sized heavy saucepan and butter the sides. Add sugar, evaporated milk, and butter to the saucepan. Turn heat to medium high, cook and stir until it's boiling. Reduce the heat to medium, allow to boil moderately for 5 minutes, stirring occasionally.

Remove the from heat and add in marshmallows, biscoff spread, and vanilla. Pour mixture into a medium-sized mixing glass bowl. Refrigerate for at least 30 minutes to 45 minutes or until mixture is thick and can be shaped.

Add white chocolate chips and shortening to a small glass microwave safe bowl and microwave on 50% power in 15 second increments. It should take 45 to 60 seconds to melt, maybe longer. In between, mix with a spoon.

Set up another baking sheet lined with parchment paper. Using two forks or two candy forks, dip truffle balls into the melted white chocolate. Tap the top the bowl with the fork to allow excess chocolate to drip off. Place on the lined baking sheet. Dip 3 to 4 truffles and then add sparkly sugar or sprinkles to them. Allow them to set. They set up even better when you refrigerate them for 15 to 20 minutes. Package them in cute little boxes for gifts!