In a stand mixer, mix butter, sugar, flour, and vanilla on medium-high speed until combined.
Add Funfetti cake mix and mix on low to start until resembles coarse crumbs.
Turn mixer to medium-high and mix until a dough ball forms.
Add sprinkles and mix until just combined.
Scoop balls of dough using a tablespoon measurement. Roll each ball in your hands to smooth them out.
Place all of the truffles on a plate and put them in the fridge for 10 minutes.
Melt the white chocolate according to package directions.
Dip each truffle, one at a time, into the white chocolate and tap the fork on the side of the bowl to remove excess chocolate. Place on a piece of parchment paper.
Repeat this step until all the truffles are coated in chocolate.
Melt the orange chocolate in a microwave-safe bowl according to package directions.
Spoon the orange chocolate into a sandwich sized zip top bag and seal. Using scissors, cut off a small corner of the bag.
Quickly drizzle the truffles with the orange chocolate and decorate with sprinkles.
Allow truffles to set for about 10 minutes.
Place all the truffles on a plate and put them in the fridge for 10 more minutes to completely harden.
Store in the fridge but serve at room temperature.