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Combine the Biscoff, butter, vanilla, cinnamon, and salt in a large bowl. Beat with an electric mixer on medium until very smooth and creamy, stopping to scrape down the bowl as necessary.
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With mixer on low, gradually beat in the powdered sugar. Once it’s all added, turn the mixer to medium and continue mixing until very well combined.
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Line a large baking sheet with parchment paper (or wax paper). Roll the mixture into 1-inch balls and arrange on the baking sheet; you should have roughly 46 balls, a few more or less is fine.
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Freeze for 30 minutes, or until solid.
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Once the truffles are frozen, place the chocolate chips in a medium microwave-safe bowl. Heat in 20-second intervals, stirring after each interval, until the chocolate is melted and completely smooth.
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Work with a few balls at a time, leaving the rest in the freezer. Use a fork to dip each frozen truffle in the chocolate, then set them on a parchment-lined baking sheet. Top with sprinkles if desired. (Do the sprinkles as you dip because the chocolate will start to set up quickly.)
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Place the truffles in the fridge until the chocolate is fully set, then serve.
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Uneaten truffles can be stored, layered with wax paper, in an airtight container for up to 1 week. They can also be frozen for about 2 months. You can eat them frozen or defrost them in the fridge overnight.