Conor McGregor wants to make his UFC comeback in just two months — and has offered to donate his mega payday to charity.

The Notorious challenged New Jersey fighter Frankie Edgar in a birthday tweet as the featherweight turned 38 on Wednesday.

“Happy birthday Frankie, see you in December,” McGregor wrote — with his would-be rival, suggesting discussions for a clash were already underway.

“Thanks pal, I said yes already it’s on you and @danawhite to make it happen,” Toms River brawler Edgar replied, challenging UFC president White to confirm one of the most eagerly awaited returns in mixed martial arts history.

“There you go White, make the bout,” McGregor responded. “Give my purse to charity. First responders. One for All!” the Irishman replied — plugging his booze brand, Proper Whiskey, in a hashtag.

Edgar has previously insisted he was ready to get in the octagon with 31-year-old McGregor, who has not fought since his wild brawl-sparking loss last October to Khabib Nurmagomedov — and who tweeted in March that he was retiring.

“I’m game – any weight, any time. That’s a fight that you get remembered for,” Edgar previously told TMZ.

“It’s no secret Conor is the biggest star in the sport, at least one of them, and with that comes a lot of attention.

“He’s going to be remembered for sure 20 years from now, and I want to have that on my record.”