The Paisley side fought back from a goal down to win their first ever Scottish League Cup and the first major trophy for the club in 26 years with the striker grabbing a goal
The former Burnley and Cardiff striker was on hand within a minute of the second half starting to send his side into the lead, after Esmael Goncalves had equalised an early Ryan Stevenson effort.
"I said to [Thompson] when we came out and it was 1-1 that it's written for you, you're living your boyhood dream; it was fantastic, a wonderful finish from him," Lennon told reporters.
"Stevie's a top player, he's had a wonderful career and I still feel there's the same level to come from him. We're getting the best from him on a weekly basis and that’s got to be a lot of credit to him, it’s Roy of the Rovers stuff from him.”
On winning the trophy, the former Raith Rovers midfielder stated that he was proud of his side and delighted to win, but admitted to being nervous when his side were defending their lead.
He added: "I'm very proud, emotional, a lot of mixed emotions to be fair and it's really just sinking in.
"I thought Hearts today played a fantastic game, more so in the first half, they certainly played the game, we played the occasion in the first half, settled down a little bit and got into the players and reminded them if they wanted to become legends, then there was a game of football to be played.
"[The 85th minute] is never a good time to concede a goal, I would have been more comfortable at 3-1, I was kicking every ball, winning every header and tackle: I've never won as many headers in my life before.
"I was just delighted, to give that to the 17,000 fans that supported us and the ones that couldn't make the game today and the community of Paisley, because we're very much as community club.
"It was certainly the peoples cup final, great credit to both sets of fans, from a personal point of view, to bring this trophy back to Paisley for the first time in this clubs wonderful 135-year history."
The 43-year-old also admitted that he needed the half-time team talk of his life to secure the victory, and thanked the club's chiefs for believing in him.
He added: "There was a wee bit of emotion, there was a wee bit of raised voices, comforting words, but more importantly reminding them that they don’t lose opportunities, because some players play their full career and never get the opportunity to play in the National Stadium in a national cup final.
"I'm absolutely thrilled for the board of directors at this football club, one, for having the belief in me and giving the great opportunity of serving this club and I'm absolutely delighted that my staff and the players could deliver that for them."