Add your room temperature butter & cream cheese to a mixing bowl and cream together.
Add in the egg & vanilla and mix until fully combined.
Add in the cake mix, 1/3 at a time, mixing in between. The batter will be very thick! Feel free to stir in more sprinkles at this point!
Spread the batter into a 9×13 baking dish that’s been lined with parchment paper and bake for 20-25 minutes at 350 degrees.
for more easy-to-make recipes without fancypants ingredients that the whole family will love.