The 17-year-old beat Florian Wirtz's record by 160 days as he netted in the 3-0 win over Bochum, and then went on to score an 11th goal in the same game.
Dortmund head coach Edin Terzic was delighted for the youngster and believes he fully deserves the plaudits after overcoming a difficult year plagued by injury.
"The fact that Youssoufa has been a talking point in every interview, in every press conference, is something he's earned through his performances," said Terzic, as quoted by the official BVB website.
"The past year hasn't been easy for him; he's had a lot of injuries to deal with. The most important thing is that he's been able to take part in every training session since the end of June without any setbacks.
"That laid the groundwork for him to be able to score the two goals today. He has taken a huge step forward in his game.
"He always offers a passing option between the lines; he is looking a lot better on the ball; he is using his body better and better, and in doing so provides us with some important seconds in which to push up."
Moukoko is confident he can continue in this rich vein of form as long as he can maintain his fitness.
"I was often injured last year," said Moukoko. "I'm happy that I have remained free of injuries up until now. If that remains the case, everything will happen by itself."