Prepare Blueberry Mixture: If using fresh blueberries, combine them with cream and butter in a saucepan. Heat over medium, stirring gently until the mixture reaches a simmer—about 2 minutes.

Blend Mixture: Using an immersion blender, purée the blueberry mixture until it's perfectly smooth.

Melt White Chocolate: In a double boiler, gently melt the white chocolate chips over simmering water, stirring frequently.

Combine Mixtures: Once the white chocolate is melted, remove from heat and gradually mix in the blueberry purée.

Chill: Transfer the combined mixture into a sealed container and refrigerate for 2-3 hours.

Form Truffles: Once chilled, scoop small amounts and roll them into 1-inch balls.

Coat: Roll each truffle in powdered sugar for a delicate finish.

Store: Store truffles in an airtight container in the refrigerator.