01 - Preheat the oven to 350°F. Grease and line a 9x13-inch baking pan.
02 - Combine the cake mix, eggs, oil, and water in a large bowl. Mix until smooth, pour into the prepared pan, and bake for 25–30 minutes or until a toothpick inserted in the center comes out clean. Let cool completely.
03 - Crumble the cooled cake into fine crumbs in a large bowl.
04 - In a separate bowl, beat the softened cream cheese (and powdered sugar, if using) until smooth.
05 - Add the cream cheese mixture to the cake crumbs. Mix thoroughly until well combined and a dough-like consistency forms.
06 - Scoop out tablespoon-sized portions and roll into balls. Place on a parchment-lined baking sheet.
07 - Freeze the cake balls for 20–30 minutes, or until firm.
08 - Melt the white chocolate chips (with coconut oil, if using) in a microwave-safe bowl in 20-second intervals, stirring until smooth.
09 - Using a fork, dip each cake ball into the melted white chocolate, letting excess drip off. Place onto a clean parchment-lined baking sheet.
10 - Decorate with sprinkles if desired. Chill the truffles in the refrigerator for at least 30 minutes, or until the coating is set.