Theo Hernandez's high hooked finish from a deflected Kylian Mbappe shot put the defending champions ahead and forced Walid Regragui's team to take the initiative, ending the game with more possession than Les Bleus.
The Tunisian captain's goal mobilised the French into action, with Deschamps bringing in stars like Kylian Mbappe and Antoine Griezmann to jump-start an attack that had so far been tepid.
36-year-old target man Giroud put the World Cup holders ahead at 2-1 with a tap-in after 32 minutes and added his second in the 71st to make the score 4-1 with a header from a Kylian Mbappe cross.
Benzema enjoyed a stellar campaign with Real Madrid last season, scoring 44 goals in 46 games in all competitions as he inspired them to a La Liga and Champions League double.
Reigning champions France take on Argentina in a showpiece final at Lusail Stadium with both teams looking to add a third star to their crest.
A reshuffled France drew 1-1 away to Croatia in their second Nations League game on Monday, four days after an opening defeat by Denmark.
Images from the FIFA World Cup match between France and Poland on Sunday.
Glimpses from Sunday's Nations League matches.
Lionel Messi's second-half goal gave Argentina a 1-0 home win over Ecuador on Thursday to get their 2026 World Cup qualifying campaign off on the right foot.
France will play Argentina, who are also looking to win the World Cup for the third time, in Sunday's final at the Lusail Stadium.
Kylian Mbappe is now expected to be paired with his favoured attacking partner in Olivier Giroud.
World champions France are facing mounting injuries ahead of their Euro 2020 Round of 16 match against Switzerland on Monday, with coach Didier Deschamps struggling for options.
Images from the Nations League football matches played on Thursday.
A round-up of Friday's action in the UEFA Nations League.
He owes his place in the team in Qatar to Karim Benzema's absence and will start again when the defending champions take on England in the quarter-finals on Saturday.
Griezmann played mainly deep, but also often close to lone striker Giroud or even on the flanks.
France started the Qatar tournament in style with a 4-1 win against Australia, but Denmark will be a sterner test at the 974 Stadium.
Deschamps said Rennes midfielder Eduardo Camavinga was called up as a late replacement for Pogba.
'We've had consistent performances over three tournaments. Tonight is the best we've played against a major nation since I've been in charge, but we have fallen short. In the end, the scoreline is what matters.'
Real Madrid's Karim Benzema, who won the 2022 Ballon d'Or award, is also in the shortlist.
The world champions crashed out of the Euros last year at the round of 16 stage after losing to Switzerland.
With no clear sense of direction being set by Deschamps' selections, it may be up to the players to find their own way to deal with Messi.
Argentina captain Lionel Messi said defending champions France and Brazil are the favourites to win the World Cup in Qatar as they have a core group of players who have played together for a long time.
Didier Deschamps, for whom a 0-0 draw with Denmark was 'mission accomplished' as his side finished top of Group C ahead of the Danes.
Both players have been timed among the fastest in the game, with top speeds of around 36.5kpm (22.6 mph), but it is how quickly they get there that makes them different.
France coach Didier Deschamps heaped praise on his players after they reached the World Cup final with a 1-0 win over Belgium on Tuesday, saying the lost final at Euro 2016 was still on his mind.
"We've once again shown the rest of the world that English football is healthy and we've got some players not only for now but for the future as well."
France hoping Mbappe will be enough to match England's impressive depth
Zinedine Zidane will not be taking over as coach of the French national team any time soon as Didier Deschamps will remain in that job for the rest of his contract,
Didier Deschamps is confident he has prepared his players for any tactical surprises his opposite number Roberto Martinez might spring
World champions France won the Nations League final with goals from Karim Benzema and Kylian Mbappe earning them a 2-1 win over Spain at the San Siro stadium on Sunday.
It took Giroud, who owed his place in the starting lineup to Benzema's absence, 115 international appearances to score his 51 goals, while Henry needed 123 from 1997-2010.
Argentina dominated the opening stages and earned the penalty when Di Maria was fouled by Ousmane Dembele, with Messi sending France keeper Hugo Lloris the wrong way to move to the top of the goalscoring charts in Qatar.
Spurs striker Bergwijn is major casualty as Netherlands trim squad
France coach Didier Deschamps did not hide his bitter disappointment after finding himself on the losing end of a final for a change on Sunday.
Following are the teams in eight groups for the 2022 FIFA World Cup, which will be held in Qatar from November 20-December 18.
In September 1998, the France players nearly created a diplomatic incident before a game against Iceland when several of them burst out laughing during the national anthems. Eighteen years on, the topic resurfaced at a news conference before Sunday's European Championship quarter-final between the two teams.
Although he did not put up a scintillating display in midfield, Pogba powered into the box after a couple of one-twos and scored with a slightly deflected lob to earn Les Bleus all three points.
The football world gathered in the Qatari capital on Friday as the draw ceremony for the World Cup finals got under way with music and dance.
France realise how dangerous Iceland can be from long throw-ins and have been working on ways to counter that weapon when they face the surprise packages of the European Championship in the quarter-finals, coach Didier Deschamps said on Saturday.