In a microwave proof mixing bowl combine dry cake mix and powdered sugar. Stir just to blend.

Add butter and milk. No need to stir.

Microwave on high for 2 minutes.

Immediately remove from microwave and carefully stir to combine. Once blended, add in white chocolate chips and blend again.

Fold in about a half of youd sprinkles to give some color.

Quickly spread fudge into a 8x8 greased pan. Add remaining sprinkles to top and gently press down to secure sprinkles. Refrigerate until completely chilled, then cut into one inch squares.