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The Parisians went ahead in the 27th minute when Zlatan Ibrahimovic played the ball into the feet of Rabiot, who then let fly with a drilled shot from distance that nestled into the bottom-left corner.
Toulouse might have pulled level just before the break as Abel Aguilar leapt highest to send a header towards the bottom corner, leaving PSG stopper Salvatore Sirigu to pull off a smart save down low.
The current champions went two ahead early in the second half when Javier Pastore sent in a ball for Rabiot, and he made no mistake with a neat finish from close range.
Blanc gave youngster Jean-Christophe Bahebeck the chance to make a name for himself and he took heed when he delivered a ball for Thiago Silva to head past Ali Ahamada in the 74th minute and wrap up the three points for PSG.