Six minutes after Casemiro had opened the scoring, Rashford was through on goal again and his shot took a deflection off Sven Botman before looping over the goalkeeper, going down as an own goal.
"Manchester United's second goal in the Carabao Cup Final officially went to Marcus Rashford! It means he finishes the competition as top scorer with six goals, having scored in every round," organisers said in a statement.
Rashford has now scored 25 goals for United this season, 17 of which have come after the World Cup break, but this was special as it delivered the Old Trafford club their first trophy since 2017 when they won the Europa League.
"A moment you dream of all your life! Scoring for the club, you support in a cup final. That one is for the fans," he wrote on Twitter.
United will next switch their focus to the FA Cup fifth round where they host West Ham United on Wednesday.
