Have your cake and eat it too
vulwaʁ lə bœʁ e laʁʒɑ̃ dy bœʁ
In French Vouloir le beurre et l'argent du beurre.
This is a very common French idiom, literally meaning 'to want the butter and the money for the butter'.
Example
"Il veut le beurre et l'argent du beurre, mais ce n'est pas possible."
