Birthday Cake Popcorn

Pop the popcorn according to the package’s instructions. Set aside. Combine the white chocolate chips and vegetable oil in a small, microwave-safe bowl and heat in 20-second intervals, stirring in between, until fully melted. Stir in the cake mix. Place the popcorn in a gallon-sized resealable bag—being careful to exclude any kernals—and add the white chocolate mixture and sprinkles. Seal and shake until the popcorn is coated. Spread onto a baking sheet in an even layer and top with additional sprinkles, if desired. Chill in the refrigerator for 20-25 minutes before serving.