Of the bigger clubs. Barca, Ajax and Chelsea are the premier producers of players to their own squad. They have nonstop and consistent talent farm for their own squad.
Then you get Real Madrid, Bayern and PSG who produce really good players, but not allways just to their own teams. Bayern better then the other two at retaining and building around their own talent.
PSG has insane amount of home grown talent in plying their trade top football. They just super impatient in nurturing them and giving them shot in main team. So hardly any of them around their team except Kimpembe, Dagba and recent youth ones . Their ceiling tend to be youth or reserve level, but I wish Juve could consistently produce senior team level of players like:
Nkunku, Coman, Maignan, Ferlan Mendy, Ikone, Moussa Dembele, Edouard, Moussa Diaby, Areola, Yacine Adli (now in Milan), Nzonzi, Soumare, Guendozi and the list goes on and on.
Man U are decent too atleast for squad level players. Rushford and McTominay only starters they produced recently, but they have pretty good academy that can readily give them depth players.