Shayon Harrison fired us into the lead after unselfish work from Filip Lesniak in the first half before Milos Veljkovic doubled the advantage seven minutes after the break.
We were in control when Harrison buried Anthony Georgiou's cross just before the hour for 3-0, although Chelsea scored a late consolation through Tammy Abraham three minutes from time.
Chelsea U21s: Beeney, Aina, Tomori, Clarke-Salter, Dabo, Colkett (c), Musonda, Sammut (Scott 54), Abraham, Mitchell (Muheim 59), J Dasilva (Maddox 54). Substitutes (not used): Conroy, Collins (GK).
Spurs U21s: Glover, Walker-Peters, Amos (Bennetts 74), Lesniak, Carter-Vickers, Veljkovic (c), McEvoy (Maghoma 82), Stylianides (Loft 67), Harrison, Walkes, Georgiou. Substitute (not used): Voss (GK).
Below: Filip Lesniak on the ball against Chelsea.