14ouncessweetened condensed milk(397g) Make sure you are not using evaporated milk. Only condensed milk will work with this recipe.
2cupsGhirardelli white chocolate chips(340g) I only recommend Ghirardelli chocolate chips for this fudge. I have had no problems with this brand whereas people have not had their fudge set up properly with other chips.
¼cupwhite or "funfetti" cake mix (40g) not prepared -- just use the powdered mix straight out of the box. I use Pillsbury.
2Tablespoonscolored sprinkles or a mix of sprinkles and nonpareils+ additional to sprinkle on top, if desired
Line an 8x8 pan with parchment paper. Set aside.
Combine condensed milk, chocolate chips, and butter in a medium-sized saucepan over medium heat. Stir frequently until butter and chocolate chips are completely melted and mixture is well-combined.
Reduce heat to low, and add cake mix and vanilla extract.
Stir well, until cake mix is completely absorbed.
Remove from heat and stir in 2 Tablespoons sprinkles/nonpareils. Immediately pour into prepared pan, use a spatula to gently smooth the surface.
Decorate with additional sprinkles, if desired. Allow to cool to room temperature. If desired, chill in the refrigerator until completely firm before cutting and serving. It usually only takes several hours for my fudge to become completely firm, but since some people have had issues with their fudge setting (see note or see video) I recommend allowing it to chill overnight for best results.
Some people have commented that they have had problems with this fudge setting. I have re-tested this recipe nearly 2 dozen times now and have had friends do so in their own kitchen and have not been able to replicate this issue. One friend noted that her fudge was still soft after two hours so instead of recommending that you refrigerate for two hours or until firm (which I originally suggested in 2017) I now recommend chilling overnight. I have updated the ingredient list to include my preferred brand of chocolate chips and the cake mix and have added a photo of the ingredients I use in the post above. I've also included a step-by-step video in this recipe showing you exactly how I make this cake batter fudge in my own kitchen that I hope will be helpful!