The Arsenal youngster came off the bench to breathe life back into the Three Lions side as they came from behind to edge themselves ahead before settling for a 2-2 draw with Brazil at the Maracana.
Oxlade-Chamberlain scored a wonderful equaliser in the 68th minute before Wayne Rooney edged England in front, prior to Paulinho's final leveller, and it was the impact of the Gunners starlet which had Hart beaming.
"He [Oxlade-Chamberlain] ripped it up [after coming on]," he told ITV Sport.
"You look at all the Brazil players and there's a lot of focus on their players, then 'the Ox', 19 years old comes on and smashes us back in the game. You can't ask for much more."