The Fairly OddParents: Fairly Odder - Episode 3

Inspired by the story of King Midas, Roy wishes to Cosmo and Wanda that everything he touches turns to gold. Despite Viv's warning before, his "Roydas Touch” goes awry when he accidentally turns his mom, Rachel Raskin, into a golden statue - which they then exhibit museum-style. She's restored back to normal once Roy wishes exactly that.

Video of the scene.