have your cake and eat it (too)

US /hæv jʊər keɪk ænd iːt ɪt tuː/
UK /hæv jʊər keɪk ænd iːt ɪt tuː/
"have your cake and eat it (too)" picture
1.

tenerlo todo, querer lo imposible

to want or try to do two things that are impossible to do at the same time

:
You can't have your cake and eat it too; you need to choose between your career and your hobby.
No puedes tenerlo todo; necesitas elegir entre tu carrera y tu pasatiempo.
She wants to work full-time and also travel the world, but she can't have her cake and eat it too.
Ella quiere trabajar a tiempo completo y también viajar por el mundo, pero no puede tenerlo todo.