The Sierra Leone forward came off the bench for the final 30 minutes of Saturday's victory over Everton, scoring a late equaliser with a towering header from a corner before captain Grant Holt netted in injury time to give Chris Hughton's men a first league win in 10 attempts.
Kamara left his homeland aged 14 before eventually migrating to the United States from Gambia and going on to play football at college, which led him into Major League Soccer and a clash with Sir Alex Ferguson's star-studded squad during their pre-season tour in 2010.
"We played against United when I was with the Kansas City Wizards and they were on a pre-season tour of America," Kamara said.
"We were the only team to beat them, I scored and got an assist in a 2-1 win.
"Almost everyone was in the United team, (Paul) Scholes and (Ryan) Giggs were playing and (Dimitar) Berbatov scored their goal, all their top guys were playing.
"So I may be a marked man against them next week now, but that actually makes it a lot of fun for me. I am used to being man-marked in America and it just means I have to work much harder because you have to do different tricks to get past people and I really enjoy that."
Following an unsuccessful trial at Stoke in December, the 28-year-old - whose move to Norwich could be made permanent in the summer - intends to make the most of the chance given to him by Hughton and an opportunity to bring his charity work to a new audience.
"It is a great, great moment in my life. It means a lot to me to be the first player from Sierra Leone to score in the Premier League," Kamara said.
Speaking about his charity work, he added: "It is something I have been doing for the last few years and I am building up the foundation in America.
"It means I can give something back to the people in my country. It will provide kids in Sierra Leone with school fees and scholarships. I am just trying to help them as much as I can.
"Hopefully it will help the kids to have hopes and dreams and to realise that they can do something in life."
Kamara commands a physical presence at 6ft 2in and his enthusiastic displays from the bench have made him an instant hit with the Norwich supporters, one of whom brought a Sierra Leone flag to Carrow Road yesterday.
"The fans seem to like me and I love to feed off the crowd. I love all the interaction," he said.
"Training every day is helping me and I had five minutes before and now 25 minutes, so I am slowly working my way up to full fitness.
"At the moment I am just focusing on each game and trying to help the team as much as I can.
"I want to help Norwich stay up and if I do that hopefully the fans will love me even more.
"I am living the dream and my story is still going on and I am just trying to add new chapters to it and compete at the highest level I can."