Logan Costa and Thijs Dallinga both scored twice as Toulouse crushed holders Nantes 5-1 on Saturday to win the French Cup for the first time since 1957.
Costa headed Toulouse in front inside four minutes, adding a second in similar fashion before Dallinga bagged a brace with barely half an hour played at the Stade de France.
Zakaria Aboukhlal rounded off a memorable triumph for Toulouse late in the second half after Ludovic Blas struck a consolation from the spot for Nantes.
"It's an iconic competition in this country and we're proud. We've done it, we've gone down in club history," said Costa.
However, Toulouse risk being unable to play in Europe next season if AC Milan qualify for the Champions League or Europa League as both clubs are owned by US investment firm RedBird Capital Partners.
Monaco CL hopes fade
Monaco's hopes of qualifying for next season's Champions League were dealt a new blow on Sunday in a comprehensive 4-0 home defeat at the hands of Montpellier in the principality.
Arnaud Nordin, a childhood friend of Kylian Mbappe from their time spent at France's Clairefontaine national youth academy, was the hero for Montpellier with two goals.
Faitout Maouassa and English former Arsenal winger Stephy Mavididi also scored for the away side as they effectively secured survival by moving 11 points clear of the bottom four with five games remaining.
This was a second successive heavy defeat for Monaco, after Philippe Clement's team went down 3-0 away at Lens last weekend.
They remain fourth in the table, five points behind third-placed Lens who do not play until Tuesday.