Chairman Steve Gibson took the bold step of halving ticket prices for Friday's match, and the 28,229 supporters who attended were rewarded with a rousing win that lifted Boro into top spot.
Boro have struggled to attract big crowds since their relegation to the npower Championship in May 2009, with a Premier League defeat to Manchester United in that month marking the last time that a league match drew such a crowd to the Riverside.
Mowbray said: "It was great to have such a big crowd there for us. A big thank you to all the supporters who came, and thanks to the chairman who put the deal together.
"That's what I know the Riverside as. We had 11 years in the Premier League with the stadium full. I think the supporters hopefully enjoyed the game, seeing their team go top of the table and scoring three goals. I think it was an entertaining game.
"It's a 35,000-seater stadium and we've had 13, 14 and 15,000 this season and that's woefully empty. We're very appreciative of the people who've come along and spent their hard-earned money in the support of our club."