Kyle Walker-Peters fired us ahead on 62 minutes, with Ismail Azzaoui extending our lead three minutes later - in doing so, continuing his record of scoring in every round of the competition this season.
Matthew Cash pulled a goal back for the hosts on 71 minutes but we saw out the game to make it through to the semi-finals as 2-1 winners.
Nottingham Forest: Erlandsson, Yates, Kelly, Crookes (c), Worrall, Iacovitti, Burke, Cash, McDonagh (Walton 79), Walker, Gamblen (Thomas 37 (Karo 79)). Substitutes (not used): Dearle, Burns.
Spurs: Voss, Walker-Peters, Walkes, Amos, Maghoma, Carter-Vickers, Daly (Loft 71), Stylianides, Harrison, Onomah, Azzaoui. Substitutes (not used): Paul, Owens, Ross, Glover (GK).